diff --git a/examples/data.js b/examples/data.js
index af1bb412..50e6a49f 100644
--- a/examples/data.js
+++ b/examples/data.js
@@ -15,6 +15,11 @@ var sources = [
     }),
     name: 'Reference'
   },
+  {
+    viz: pileup.viz.idiogram(),
+    data: pileup.formats.cytoBand('/test-data/cytoBand.txt.gz'),
+    name: 'Idiogram'
+  },
   {
     viz: pileup.viz.scale(),
     name: 'Scale'
diff --git a/lib/underscore.js b/lib/underscore.js
index 4c46165f..f0c24870 100644
--- a/lib/underscore.js
+++ b/lib/underscore.js
@@ -42,6 +42,7 @@ declare module "underscore" {
   declare function groupBy<K, T>(a: Array<T>, iteratee: (val: T, index: number)=>K): {[key:K]: T[]};
 
   declare function min<T>(a: Array<T>|{[key:any]: T}, iteratee: (val: T)=>any): T;
+  declare function max<T>(a: Array<T>|{[key:any]: T}, iteratee: (val: T)=>any): T;
   declare function max<T>(a: Array<T>|{[key:any]: T}): T;
 
   declare function values<T>(o: {[key: any]: T}): T[];
diff --git a/src/main/data/chromosome.js b/src/main/data/chromosome.js
new file mode 100644
index 00000000..fbc3c5f6
--- /dev/null
+++ b/src/main/data/chromosome.js
@@ -0,0 +1,57 @@
+/**
+ * Class for parsing chromosome bands for idiograms.
+ * Format taken from https://github.com/hammerlab/idiogrammatik.
+ * @flow
+ */
+'use strict';
+
+import ContigInterval from '../ContigInterval';
+import type {CoverageCount} from '../viz/pileuputils';
+import _ from 'underscore';
+
+// chromosomal band (see https://github.com/hammerlab/idiogrammatik/blob/master/data/basic-chromosomes.json)
+// for an example
+export type Band = {
+  start: number;
+  end:  number;
+  name: string;
+  value: string;
+}
+
+class Chromosome {
+  name: string;
+  bands: Band[];
+  position: ContigInterval<string>;
+
+  constructor(chromosome: Object) {
+    this.name = chromosome.name;
+    this.bands = chromosome.bands;
+    // create region for chromosome
+    var start = _.min(this.bands, band => band.start).start;
+
+
+    var stop =  _.max(this.bands, band => band.end).end;
+    this.position = new ContigInterval(this.name, start, stop);
+  }
+
+  getKey(): string {
+    return this.name;
+  }
+
+  getInterval(): ContigInterval<string> {
+    return this.position;
+  }
+
+  getCoverage(referenceSource: Object): CoverageCount {
+    return {
+      range: this.getInterval(),
+      opInfo: null
+    };
+  }
+
+  intersects(range: ContigInterval<string>): boolean {
+    return range.intersects(this.position);
+  }
+}
+
+module.exports = Chromosome;
diff --git a/src/main/data/cytoBand.js b/src/main/data/cytoBand.js
new file mode 100644
index 00000000..d36f61cd
--- /dev/null
+++ b/src/main/data/cytoBand.js
@@ -0,0 +1,82 @@
+/**
+ * Fetcher/parser for gzipped Cytoband files. Cytoband files can be downloaded
+ * or accessed from http://hgdownload.cse.ucsc.edu/goldenpath for a genome build.
+ *
+ * extracts CONTIG, START, END, NAME and VALUE
+ *
+ * @flow
+ */
+'use strict';
+
+import type AbstractFile from '../AbstractFile';
+import type Q from 'q';
+import _ from 'underscore';
+import ContigInterval from '../ContigInterval';
+import Chromosome from './chromosome';
+import pako from 'pako/lib/inflate';  // for gzip inflation
+
+function extractLine(cytoBandLine: string): Object {
+  var split = cytoBandLine.split('\t');
+  return {
+    contig: split[0],
+    band: {
+        start: Number(split[1]),
+        end:  Number(split[2]),
+        name: split[3],
+        value: split[4]
+    }
+  };
+}
+
+function groupedBandsToChromosome(grouped: Object[]): Chromosome {
+  var bands = _.map(grouped, g => g.band);
+  return new Chromosome(
+    {name: grouped[0].contig,
+    bands: bands,
+    position: new ContigInterval(grouped[0].contig, bands[0].start, bands.slice(-1)[0].end)}
+  );
+}
+
+class ImmediateCytoBandFile {
+  chrs: {[key:string]:Chromosome};
+
+  constructor(chrs: {[key:string]:Chromosome}) {
+    this.chrs = chrs;
+  }
+
+  getFeaturesInRange(range: ContigInterval<string>): Chromosome {
+    return this.chrs[range.contig];
+  }
+}
+
+class CytoBandFile {
+  remoteFile: AbstractFile;
+  immediate: Q.Promise<ImmediateCytoBandFile>;
+
+  constructor(remoteFile: AbstractFile) {
+    this.remoteFile = remoteFile;
+
+    this.immediate = this.remoteFile.getAll().then(bytes => {
+      var txt = pako.inflate(bytes, {to: 'string'});
+      var txtLines = _.filter(txt.split('\n'), i => i); // gets rid of empty lines
+      var lines = txtLines.map(extractLine);
+      return lines;
+    }).then(lines => {
+      // group bands by contig
+      var grouped = _.groupBy(lines, l => l.contig);
+      var chrs = _.mapObject(grouped, g => groupedBandsToChromosome(g));
+      return new ImmediateCytoBandFile(chrs);
+    });
+    this.immediate.done();
+  }
+
+  getFeaturesInRange(range: ContigInterval<string>): Q.Promise<Chromosome[]> {
+    return this.immediate.then(immediate => {
+      return immediate.getFeaturesInRange(range);
+    });
+  }
+}
+
+module.exports = {
+  CytoBandFile
+};
diff --git a/src/main/data/genericFeature.js b/src/main/data/genericFeature.js
index ec3e6406..31b74f81 100644
--- a/src/main/data/genericFeature.js
+++ b/src/main/data/genericFeature.js
@@ -15,8 +15,8 @@ class GenericFeature {
   gFeature: Object;
 
   constructor(id: string, position: ContigInterval<string>, genericFeature: Object) {
-    this.id = genericFeature.id;
-    this.position = genericFeature.position;
+    this.id = id;
+    this.position = position;
     this.gFeature = genericFeature;
   }
 }
diff --git a/src/main/json/IdiogramJson.js b/src/main/json/IdiogramJson.js
new file mode 100644
index 00000000..eafb68e9
--- /dev/null
+++ b/src/main/json/IdiogramJson.js
@@ -0,0 +1,55 @@
+/**
+ * A data source which implements generic JSON protocol.
+ * Currently only used to load alignments.
+ * @flow
+ */
+'use strict';
+
+import type {DataSource} from '../sources/DataSource';
+import Chromosome from '../data/chromosome';
+
+import _ from 'underscore';
+import {Events} from 'backbone';
+
+import ContigInterval from '../ContigInterval';
+import type {GenomeRange} from '../types';
+
+function create(json: string): DataSource<Chromosome> {
+
+  // parse json
+  var parsedJson = JSON.parse(json);
+  var chromosomes: Chromosome[] = [];
+
+  // fill chromosomes with json
+  if (!_.isEmpty(parsedJson)) {
+      chromosomes = _.values(parsedJson).map(chr => new Chromosome(chr));
+  }
+
+  function rangeChanged(newRange: GenomeRange) {
+    // Data is already parsed, so immediately return
+    var range = new ContigInterval(newRange.contig, newRange.start, newRange.stop);
+    o.trigger('newdata', range);
+    o.trigger('networkdone');
+    return;
+  }
+
+  function getFeaturesInRange(range: ContigInterval<string>): Chromosome[] {
+    return _.filter(chromosomes, chr => range.chrOnContig(chr.name));
+  }
+
+  var o = {
+    rangeChanged,
+    getFeaturesInRange,
+
+    on: () => {},
+    once: () => {},
+    off: () => {},
+    trigger: (string, any) => {}
+  };
+  _.extend(o, Events);
+  return o;
+}
+
+module.exports = {
+  create
+};
diff --git a/src/main/pileup.js b/src/main/pileup.js
index 074d3d7d..4ecd60f8 100644
--- a/src/main/pileup.js
+++ b/src/main/pileup.js
@@ -17,6 +17,8 @@ import saveAs from 'file-saver';
 
 // Data sources
 import TwoBitDataSource from './sources/TwoBitDataSource';
+import CytoBandDataSource from './sources/CytoBandDataSource';
+
 import BigBedDataSource from './sources/BigBedDataSource';
 import VcfDataSource from './sources/VcfDataSource';
 import BamDataSource from './sources/BamDataSource';
@@ -29,6 +31,7 @@ import Interval from './Interval';
 import GA4GHAlignmentJson from './json/GA4GHAlignmentJson';
 import GA4GHVariantJson from './json/GA4GHVariantJson';
 import GA4GHFeatureJson from './json/GA4GHFeatureJson';
+import IdiogramJson from './json/IdiogramJson';
 
 // GA4GH sources
 import GA4GHAlignmentSource from './sources/GA4GHAlignmentSource';
@@ -41,6 +44,7 @@ import CoverageTrack from './viz/CoverageTrack';
 import GenomeTrack from './viz/GenomeTrack';
 import GeneTrack from './viz/GeneTrack';
 import FeatureTrack from './viz/FeatureTrack';
+import IdiogramTrack from './viz/IdiogramTrack';
 import LocationTrack from './viz/LocationTrack';
 import PileupTrack from './viz/PileupTrack';
 import ScaleTrack from './viz/ScaleTrack';
@@ -236,6 +240,8 @@ var pileup = {
     alignmentJson: GA4GHAlignmentJson.create,
     variantJson: GA4GHVariantJson.create,
     featureJson: GA4GHFeatureJson.create,
+    idiogramJson: IdiogramJson.create,
+    cytoBand: CytoBandDataSource.create,
     vcf: VcfDataSource.create,
     twoBit: TwoBitDataSource.create,
     bigBed: BigBedDataSource.create,
@@ -250,6 +256,7 @@ var pileup = {
     genome:   makeVizObject(GenomeTrack),
     genes:    makeVizObject(GeneTrack),
     features: makeVizObject(FeatureTrack),
+    idiogram:  makeVizObject(IdiogramTrack),
     location: makeVizObject(LocationTrack),
     scale:    makeVizObject(ScaleTrack),
     variants: makeVizObject(VariantTrack),
diff --git a/src/main/sources/CytoBandDataSource.js b/src/main/sources/CytoBandDataSource.js
new file mode 100644
index 00000000..10398f60
--- /dev/null
+++ b/src/main/sources/CytoBandDataSource.js
@@ -0,0 +1,83 @@
+/**
+ * The "glue" between cytoBand.js and IdiogramTrack.js.
+ *
+ * Allows loading remote gzipped cytoband files into an Idiogram visualization.
+ *
+ * @flow
+ */
+'use strict';
+
+import _ from 'underscore';
+import {Events} from 'backbone';
+
+import ContigInterval from '../ContigInterval';
+import Chromosome from '../data/chromosome';
+import type {GenomeRange} from '../types';
+import {CytoBandFile} from '../data/cytoBand';
+import type {DataSource} from '../sources/DataSource';
+
+import RemoteFile from '../RemoteFile';
+import utils from '../utils';
+
+var createFromCytoBandFile = function(remoteSource: CytoBandFile): DataSource<Chromosome> {
+  // Local cache of genomic data.
+  var contigMap: {[key:string]: Chromosome} = {};
+
+  // This either adds or removes a 'chr' as needed.
+  function normalizeRange(range: ContigInterval<string>): ContigInterval<string> {
+    if (contigMap[range.contig] !== undefined) {
+      return range;
+    }
+    var altContig = utils.altContigName(range.contig);
+    if (contigMap[altContig] !== undefined) {
+      return new ContigInterval(altContig, range.start(), range.stop());
+    }
+    return range;
+  }
+
+  function fetch(range: ContigInterval<string>) {
+    remoteSource.getFeaturesInRange(range)
+      .then(chr => {
+        contigMap[chr.name] = chr;
+      }).then(() => {
+        o.trigger('newdata', range);
+      }).done();
+  }
+
+  function getFeaturesInRange(range: ContigInterval<string>): Chromosome[] {
+    return [contigMap[normalizeRange(range).contig]];
+  }
+
+  var o = {
+    // The range here is 0-based, inclusive
+    rangeChanged: function(newRange: GenomeRange) {
+      // Check if this interval is already in the cache.
+      if ( contigMap[newRange.contig] !== undefined ) {
+        return;
+      }
+      fetch(new ContigInterval(newRange.contig, newRange.start, newRange.stop));
+    },
+    getFeaturesInRange,
+    // These are here to make Flow happy.
+    on: () => {},
+    once: () => {},
+    off: () => {},
+    trigger: (status: string, param: any) => {}
+  };
+  _.extend(o, Events);  // Make this an event emitter
+
+  return o;
+};
+
+function create(url:string): DataSource<Chromosome> {
+  if (!url) {
+    throw new Error(`Missing URL from track: ${url}`);
+  }
+  return createFromCytoBandFile(new CytoBandFile(new RemoteFile(url)));
+}
+
+
+module.exports = {
+  create,
+  createFromCytoBandFile,
+};
diff --git a/src/main/sources/DataSource.js b/src/main/sources/DataSource.js
index 72b68510..80a1c5e0 100644
--- a/src/main/sources/DataSource.js
+++ b/src/main/sources/DataSource.js
@@ -7,11 +7,12 @@ import type {GenomeRange} from '../types';
 import type ContigInterval from '../ContigInterval';
 
 import type {Alignment} from '../Alignment';
+import Chromosome from '../data/chromosome';
 import Feature from '../data/feature';
 import Gene from '../data/gene';
 
 // Flow type for export.
-export type DataSource<T: ( Gene | Feature | Alignment )> = {
+export type DataSource<T: ( Gene | Feature | Alignment | Chromosome)> = {
   rangeChanged: (newRange: GenomeRange) => void;
   getFeaturesInRange: (range: ContigInterval<string>, resolution: ?number) => T[];
   on: (event: string, handler: Function) => void;
diff --git a/src/main/style.js b/src/main/style.js
index 4b2088f8..0e9f62c3 100644
--- a/src/main/style.js
+++ b/src/main/style.js
@@ -59,6 +59,21 @@ module.exports = {
   READ_SPACING: 2, // vertical spacing between reads
   READ_HEIGHT: 13, // Height of read
 
+  // Idiogram track
+  IDIOGRAM_LINEWIDTH: 1,
+  IDIOGRAM_COLORS: {
+    "gpos100": "#000000",
+    "gpos": "#000000",
+    "gpos75": "#828282",
+    "gpos66": "#a0a0a0",
+    "gpos50": "#c8c8c8",
+    "gpos33": "#d2d2d2",
+    "gpos25": "#c8c8c8",
+    "gvar": "#dcdcdc",
+    "gneg": "#ffffff",
+    "acen": "#d92f27",
+    "stalk": "#647fa4",
+  },
 
   // Coverage track
   COVERAGE_FONT_STYLE: `bold 9px 'Helvetica Neue', Helvetica, Arial, sans-serif`,
diff --git a/src/main/viz/GeneTrack.js b/src/main/viz/GeneTrack.js
index cdb8c872..1d56c73b 100644
--- a/src/main/viz/GeneTrack.js
+++ b/src/main/viz/GeneTrack.js
@@ -193,7 +193,7 @@ class GeneTrack extends React.Component<VizProps<DataSource<Gene>>, State> {
 
         ctx.popObject();
       });
-    } // end typecheck for canvasß
+    } // end typecheck for canvas
   }
 }
 
diff --git a/src/main/viz/IdiogramTrack.js b/src/main/viz/IdiogramTrack.js
new file mode 100644
index 00000000..f80ddd09
--- /dev/null
+++ b/src/main/viz/IdiogramTrack.js
@@ -0,0 +1,185 @@
+/**
+ * A track which shows an idiogram.
+ *
+ * @flow
+ */
+'use strict';
+
+import type {VizProps} from '../VisualizationWrapper';
+import type {State} from '../types';
+import type {DataSource} from '../sources/DataSource';
+import React from 'react';
+import ContigInterval from '../ContigInterval';
+import Chromosome from '../data/chromosome';
+import canvasUtils from './canvas-utils';
+import dataCanvas from 'data-canvas';
+import style from '../style';
+
+import ReactDOM from 'react-dom';
+import shallowEquals from 'shallow-equals';
+import d3utils from './d3utils';
+import _ from 'underscore';
+
+import GenericFeature from '../data/genericFeature';
+import {GenericFeatureCache} from './GenericFeatureCache';
+
+function gstainFiller(d): string {
+  var stain = style.IDIOGRAM_COLORS[d.value];
+  if (stain === undefined) {
+    return 'white';
+  } else {
+    return stain;
+  }
+}
+
+class IdiogramTrack extends React.Component<VizProps<DataSource<Chromosome>>, State> {
+  props: VizProps<DataSource<Chromosome>>;
+  state: State;
+  cache: GenericFeatureCache;
+
+  constructor(props: VizProps<DataSource<Chromosome>>) {
+    super(props);
+    this.state = {
+      networkStatus: null
+    };
+  }
+
+  render(): any {
+    return <canvas />;
+  }
+
+  componentDidMount() {
+    this.cache = new GenericFeatureCache(this.props.referenceSource);
+    // Visualize new reference data as it comes in from the network.
+    this.props.source.on('newdata', (range) => {
+      // add to generic cache
+      var chrs = this.props.source.getFeaturesInRange(range);
+      chrs.forEach(chr => this.cache.addFeature(new GenericFeature(chr.name, chr.position, chr))) ;
+      this.updateVisualization();
+    });
+    this.props.referenceSource.on('newdata', range => {
+      this.updateVisualization();
+    });
+    this.props.source.on('networkprogress', e => {
+      this.setState({networkStatus: e});
+    });
+    this.props.source.on('networkdone', e => {
+      this.setState({networkStatus: null});
+    });
+
+    this.updateVisualization();
+  }
+
+  componentDidUpdate(prevProps: any, prevState: any) {
+    if (!shallowEquals(this.props, prevProps) ||
+      !shallowEquals(this.state, prevState)) {
+      this.updateVisualization(prevProps);
+    }
+  }
+
+  updateVisualization(prevProps: any) {
+    var canvas = ReactDOM.findDOMNode(this),
+      {width, height} = this.props;
+
+    var range = new ContigInterval(this.props.range.contig, this.props.range.start, this.props.range.stop);
+
+    // Hold off until height & width are known.
+    if (width === 0 || typeof canvas == 'undefined' || canvas == null) return;
+
+    this.updateChromosome(canvas, height, width,range);
+    this.updateChromosomeLocation(canvas, height, width, range);
+  }
+
+  updateChromosomeLocation(canvas: Object, height: number, width: number ,range: ContigInterval<string>) {
+    var chrs = _.flatten(_.map(this.cache.getGroupsOverlapping(range),
+      g => g.items));
+
+
+    // Hold off until height & width are known.
+    if (width === 0 || typeof canvas == 'undefined' || canvas == null) return;
+
+    if (!chrs || chrs.length == 0) {
+      return;
+    }
+    var chr = chrs[0];
+    var ctx = dataCanvas.getDataContext(canvasUtils.getContext(canvas));
+
+    var iv = {'start':chr.position.start(),
+      'stop': chr.position.stop()};
+    var sc = d3utils.getTrackScale(iv, this.props.width);
+
+    var viewWidth = Math.ceil(sc(range.stop()) - sc(range.start()) );
+    ctx.strokeStyle='red';
+    ctx.strokeRect(sc(range.start()),
+                 style.IDIOGRAM_LINEWIDTH*2,
+                 viewWidth,
+                 style.READ_HEIGHT);
+
+    ctx.popObject();
+  }
+
+  updateChromosome(canvas: Object, height: number, width: number, range: ContigInterval<string>) {
+
+    // Hold off until height & width are known.
+    if (width === 0 || typeof canvas == 'undefined' || canvas == null) return;
+
+    d3utils.sizeCanvas(canvas, width, height);
+    var ctx = dataCanvas.getDataContext(canvasUtils.getContext(canvas));
+
+    ctx.reset();
+    ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
+
+    height = d3utils.heightForCanvas(canvas, style.READ_HEIGHT);
+
+    var chrs = _.flatten(_.map(this.cache.getGroupsOverlapping(range),
+                  g => g.items));
+
+    chrs.forEach(chr => {
+      var iv = {'start':chr.position.start(),
+        'stop': chr.position.stop()};
+      // add bands
+      var band_sc = d3utils.getTrackScale(iv, this.props.width);
+      chr.gFeature.bands.forEach(band => {
+        ctx.pushObject(band);
+        var filler = gstainFiller(band);
+
+        var width = Math.ceil(band_sc(band.end) - band_sc(band.start));
+        var start = band_sc(band.start)+style.IDIOGRAM_LINEWIDTH;
+
+
+        if (band.value == "acen") {
+          ctx.fillStyle='red';
+          ctx.beginPath();
+          if (band.name.startsWith("p")) {
+            ctx.moveTo(start+style.IDIOGRAM_LINEWIDTH, style.IDIOGRAM_LINEWIDTH*2 );
+            ctx.lineTo(start+width,style.READ_HEIGHT/2);
+            ctx.lineTo(start+style.IDIOGRAM_LINEWIDTH, style.READ_HEIGHT+style.IDIOGRAM_LINEWIDTH);
+            ctx.fill();
+          } else {
+            ctx.moveTo(start+style.IDIOGRAM_LINEWIDTH, style.READ_HEIGHT/2);
+            ctx.lineTo(start+width,style.IDIOGRAM_LINEWIDTH*2);
+            ctx.lineTo(start+width, style.READ_HEIGHT+style.IDIOGRAM_LINEWIDTH);
+            ctx.fill();
+          }
+        } else {
+          ctx.fillStyle = filler;
+          ctx.strokeStyle = 'black';
+          ctx.fillRect(start,
+                       style.IDIOGRAM_LINEWIDTH*2,
+                       width,
+                       style.READ_HEIGHT);
+          ctx.strokeRect(start,
+                      style.IDIOGRAM_LINEWIDTH*2,
+                      width,
+                      style.READ_HEIGHT);
+        }
+        ctx.popObject();
+      });
+    });
+  }
+
+}
+
+IdiogramTrack.displayName = 'idiogram';
+
+module.exports = IdiogramTrack;
diff --git a/src/test/data/cytoBand-test.js b/src/test/data/cytoBand-test.js
new file mode 100644
index 00000000..c94aa9fb
--- /dev/null
+++ b/src/test/data/cytoBand-test.js
@@ -0,0 +1,26 @@
+/* @flow */
+'use strict';
+
+import {expect} from 'chai';
+
+import {CytoBandFile} from '../../main/data/cytoBand';
+import ContigInterval from '../../main/ContigInterval';
+import RemoteFile from '../../main/RemoteFile';
+
+describe('CytoBand', function() {
+  var remoteFile = new RemoteFile('/test-data/cytoBand.txt.gz');
+
+  it('should get chromosomes from cytoband file', function(): any {
+    var cytoBand = new CytoBandFile(remoteFile);
+    var range = new ContigInterval('chr20', 63799, 69094);
+
+    return cytoBand.getFeaturesInRange(range).then(chr => {
+      expect(chr.name).to.equal('chr20');
+      expect(chr.position.start()).to.equal(0);
+      expect(chr.position.stop()).to.equal(63025520);
+      expect(chr.bands).to.have.length(20);
+      expect(chr.bands[0].name).to.equal('p13');
+      expect(chr.bands[0].value).to.equal('gneg');
+    });
+  });
+});
diff --git a/src/test/json/IdiogramJson-test.js b/src/test/json/IdiogramJson-test.js
new file mode 100644
index 00000000..041a5c47
--- /dev/null
+++ b/src/test/json/IdiogramJson-test.js
@@ -0,0 +1,42 @@
+/** @flow */
+'use strict';
+
+import {expect} from 'chai';
+
+import ContigInterval from '../../main/ContigInterval';
+import IdiogramJson from '../../main/json/IdiogramJson';
+import RemoteFile from '../../main/RemoteFile';
+
+describe('IdiogramJson', function() {
+  var json;
+
+  before(function(): any {
+    return new RemoteFile('/test-data/gstained_chromosomes_data.json').getAllString().then(data => {
+      json = data;
+    });
+  });
+
+  it('should filter features from json', function(done) {
+
+    var source = IdiogramJson.create(json);
+
+    var requestInterval = new ContigInterval('chr1', 130000, 135000);
+
+    var features = source.getFeaturesInRange(requestInterval)[0];
+    expect(features.bands).to.have.length(63);
+    done();
+
+  });
+
+  it('should not fail on empty json string', function(done) {
+
+    var source = IdiogramJson.create("{}");
+
+    var requestInterval = new ContigInterval('chr17', 10, 20);
+
+    var chromosomes = source.getFeaturesInRange(requestInterval);
+    expect(chromosomes).to.have.length(0);
+    done();
+
+  });
+});
diff --git a/src/test/sources/CytoBandDataSource-test.js b/src/test/sources/CytoBandDataSource-test.js
new file mode 100644
index 00000000..6285d44e
--- /dev/null
+++ b/src/test/sources/CytoBandDataSource-test.js
@@ -0,0 +1,52 @@
+/* @flow */
+'use strict';
+
+import {expect} from 'chai';
+
+import CytoBandDataSource from '../../main/sources/CytoBandDataSource';
+import {CytoBandFile} from '../../main/data/cytoBand';
+import RemoteFile from '../../main/RemoteFile';
+import ContigInterval from '../../main/ContigInterval';
+
+describe('CytoBandDataSource', function() {
+  function getTestSource () {
+    // cytoband file downloaded from
+    // http://hgdownload.cse.ucsc.edu/goldenpath/hg19/database/cytoBand.txt.gz
+    var f = new CytoBandFile(new RemoteFile('/test-data/cytoBand.txt.gz'));
+    return CytoBandDataSource.createFromCytoBandFile(f);
+  }
+
+  it('should fetch chromsome', function(done) {
+    var source = getTestSource();
+    var range = new ContigInterval('chr22',0,3);
+    // Before data has been fetched, all base pairs are null.
+    expect(source.getFeaturesInRange(range)).to.deep.equal([undefined]);
+
+    source.on('newdata', () => {
+      var chr = source.getFeaturesInRange(range)[0];
+      expect(chr.name).to.equal('chr22');
+      expect(chr.bands).to.have.length(16);
+      expect(chr.bands[0].name).to.equal('p13');
+      expect(chr.bands[0].value).to.equal('gvar');
+      done();
+    });
+    source.rangeChanged(range);
+  });
+
+  it('should allow a mix of chr and non-chr', function(done) {
+    var source = getTestSource();
+    var chrRange = {contig: 'chr1', start: 0, stop: 3};
+
+    var range = new ContigInterval('1',0,3);
+
+    source.on('newdata', () => {
+      var chr = source.getFeaturesInRange(range)[0];
+      expect(chr.name).to.equal('chr1');
+      expect(chr.bands).to.have.length(63);
+      expect(chr.bands[0].name).to.equal('p36.33');
+      expect(chr.bands[0].value).to.equal('gneg');
+      done();
+    });
+    source.rangeChanged(chrRange);
+  });
+});
diff --git a/src/test/viz/IdiogramTrack-test.js b/src/test/viz/IdiogramTrack-test.js
new file mode 100644
index 00000000..c31b9a51
--- /dev/null
+++ b/src/test/viz/IdiogramTrack-test.js
@@ -0,0 +1,105 @@
+/**
+ * This tests whether feature information is being shown/drawn correctly
+ * in the track.
+ *
+ * @flow
+ */
+'use strict';
+
+import pileup from '../../main/pileup';
+import dataCanvas from 'data-canvas';
+import {waitFor} from '../async';
+import {expect} from 'chai';
+import RemoteFile from '../../main/RemoteFile';
+
+describe('IdiogramTrack', function() {
+  var testDiv= document.getElementById('testdiv');
+  if (!testDiv) throw new Error("Failed to match: testdiv");
+
+  var drawnObjects = dataCanvas.RecordingContext.drawnObjects;
+
+  function ready(): boolean {
+      return testDiv.querySelector('.idiogram canvas') !== null &&
+          testDiv.querySelector('.idiogram canvas') !== undefined &&
+          drawnObjects(testDiv, '.idiogram').length > 0;
+  }
+
+  beforeEach(() => {
+    testDiv.style.width = '800px';
+    dataCanvas.RecordingContext.recordAll();
+  });
+
+  afterEach(() => {
+    dataCanvas.RecordingContext.reset();
+    // avoid pollution between tests.
+    testDiv.innerHTML = '';
+  });
+
+  describe('json features', function() {
+    var json;
+
+    before(function(): any {
+      return new RemoteFile('/test-data/gstained_chromosomes_data.json').getAllString().then(data => {
+        json = data;
+      });
+    });
+
+    it('should render idiogram with json', function(): any {
+      var p = pileup.create(testDiv, {
+        range: {contig: 'chr17', start: 7500000, stop: 7500500},
+        tracks: [
+          {
+            viz: pileup.viz.genome(),
+            data: pileup.formats.twoBit({
+              url: '/test-data/test.2bit'
+            }),
+            isReference: true
+          },
+          {
+            viz: pileup.viz.idiogram(),
+            data: pileup.formats.idiogramJson(json),
+            name: 'Idiogram'
+          }
+        ]
+      });
+
+      return waitFor(ready, 2000)
+        .then(() => {
+          var bands = drawnObjects(testDiv, '.idiogram');
+          expect(bands).to.have.length(24);
+          p.destroy();
+        });
+    });
+  });
+
+  describe('cytoband features', function() {
+
+    it('should render idiogram with gzipped file', function(): any {
+      var p = pileup.create(testDiv, {
+        range: {contig: 'chr1', start: 7500000, stop: 7500500},
+        tracks: [
+          {
+            viz: pileup.viz.genome(),
+            data: pileup.formats.twoBit({
+              url: '/test-data/test.2bit'
+            }),
+            isReference: true
+          },
+          {
+            viz: pileup.viz.idiogram(),
+            data: pileup.formats.cytoBand('/test-data/cytoBand.txt.gz'),
+            name: 'Idiogram'
+          }
+        ]
+      });
+
+      return waitFor(ready, 2000)
+        .then(() => {
+          var bands = drawnObjects(testDiv, '.idiogram');
+          expect(bands).to.have.length(63);
+          p.destroy();
+        });
+    });
+
+  });
+});
diff --git a/style/pileup.css b/style/pileup.css
index 11044df0..4c911985 100644
--- a/style/pileup.css
+++ b/style/pileup.css
@@ -60,14 +60,21 @@
   overflow-x: hidden;
   position: relative;
 }
-.features > .track-content, .pileup > .track-content, .genes > .track-content,
-.variants > .track-content, .coverage > .track-content {
+.track-content {
     border-top-left-radius: 5px;
     border-bottom-left-radius: 5px;
     border-color: #bcbbbb;
     border-left: 7px solid #bcbbbb;
 }
 
+.reference > .track-content, .controls > .track-content,
+    .scale > .track-content, .location > .track-content {
+        border-top-left-radius: 0px;
+        border-bottom-left-radius: 0px;
+        border-color: None;
+        border-left: None;
+}
+
 .track-content > div {
   position: absolute; /* Gets the child of the flex-item to fill height 100% */
 }
diff --git a/test-data/cytoBand.txt.gz b/test-data/cytoBand.txt.gz
new file mode 100644
index 00000000..ee9ab76f
Binary files /dev/null and b/test-data/cytoBand.txt.gz differ
diff --git a/test-data/gstained_chromosomes_data.json b/test-data/gstained_chromosomes_data.json
new file mode 100644
index 00000000..ffcd866a
--- /dev/null
+++ b/test-data/gstained_chromosomes_data.json
@@ -0,0 +1,5294 @@
+[
+    {
+        "bands": [
+            {
+                "start": 0,
+                "end": 2300000,
+                "name": "p36.33",
+                "value": "gneg"
+            },
+            {
+                "start": 2300000,
+                "end": 5300000,
+                "name": "p36.32",
+                "value": "gpos"
+            },
+            {
+                "start": 5300000,
+                "end": 7100000,
+                "name": "p36.31",
+                "value": "gneg"
+            },
+            {
+                "start": 7100000,
+                "end": 9100000,
+                "name": "p36.23",
+                "value": "gpos"
+            },
+            {
+                "start": 9100000,
+                "end": 12500000,
+                "name": "p36.22",
+                "value": "gneg"
+            },
+            {
+                "start": 12500000,
+                "end": 15900000,
+                "name": "p36.21",
+                "value": "gpos"
+            },
+            {
+                "start": 15900000,
+                "end": 20100000,
+                "name": "p36.13",
+                "value": "gneg"
+            },
+            {
+                "start": 20100000,
+                "end": 23600000,
+                "name": "p36.12",
+                "value": "gpos"
+            },
+            {
+                "start": 23600000,
+                "end": 27600000,
+                "name": "p36.11",
+                "value": "gneg"
+            },
+            {
+                "start": 27600000,
+                "end": 29900000,
+                "name": "p35.3",
+                "value": "gpos"
+            },
+            {
+                "start": 29900000,
+                "end": 32300000,
+                "name": "p35.2",
+                "value": "gneg"
+            },
+            {
+                "start": 32300000,
+                "end": 34300000,
+                "name": "p35.1",
+                "value": "gpos"
+            },
+            {
+                "start": 34300000,
+                "end": 39600000,
+                "name": "p34.3",
+                "value": "gneg"
+            },
+            {
+                "start": 39600000,
+                "end": 43700000,
+                "name": "p34.2",
+                "value": "gpos"
+            },
+            {
+                "start": 43700000,
+                "end": 46300000,
+                "name": "p34.1",
+                "value": "gneg"
+            },
+            {
+                "start": 46300000,
+                "end": 50200000,
+                "name": "p33",
+                "value": "gpos"
+            },
+            {
+                "start": 50200000,
+                "end": 55600000,
+                "name": "p32.3",
+                "value": "gneg"
+            },
+            {
+                "start": 55600000,
+                "end": 58500000,
+                "name": "p32.2",
+                "value": "gpos"
+            },
+            {
+                "start": 58500000,
+                "end": 60800000,
+                "name": "p32.1",
+                "value": "gneg"
+            },
+            {
+                "start": 60800000,
+                "end": 68500000,
+                "name": "p31.3",
+                "value": "gpos"
+            },
+            {
+                "start": 68500000,
+                "end": 69300000,
+                "name": "p31.2",
+                "value": "gneg"
+            },
+            {
+                "start": 69300000,
+                "end": 84400000,
+                "name": "p31.1",
+                "value": "gpos"
+            },
+            {
+                "start": 84400000,
+                "end": 87900000,
+                "name": "p22.3",
+                "value": "gneg"
+            },
+            {
+                "start": 87900000,
+                "end": 91500000,
+                "name": "p22.2",
+                "value": "gpos"
+            },
+            {
+                "start": 91500000,
+                "end": 94300000,
+                "name": "p22.1",
+                "value": "gneg"
+            },
+            {
+                "start": 94300000,
+                "end": 99300000,
+                "name": "p21.3",
+                "value": "gpos"
+            },
+            {
+                "start": 99300000,
+                "end": 101800000,
+                "name": "p21.2",
+                "value": "gneg"
+            },
+            {
+                "start": 101800000,
+                "end": 106700000,
+                "name": "p21.1",
+                "value": "gpos"
+            },
+            {
+                "start": 106700000,
+                "end": 111200000,
+                "name": "p13.3",
+                "value": "gneg"
+            },
+            {
+                "start": 111200000,
+                "end": 115500000,
+                "name": "p13.2",
+                "value": "gpos"
+            },
+            {
+                "start": 115500000,
+                "end": 117200000,
+                "name": "p13.1",
+                "value": "gneg"
+            },
+            {
+                "start": 117200000,
+                "end": 120400000,
+                "name": "p12",
+                "value": "gpos"
+            },
+            {
+                "start": 120400000,
+                "end": 121700000,
+                "name": "p11.2",
+                "value": "gneg"
+            },
+            {
+                "start": 121700000,
+                "end": 123400000,
+                "name": "p11.1",
+                "value": "acen"
+            },
+            {
+                "start": 123400000,
+                "end": 125100000,
+                "name": "q11",
+                "value": "acen"
+            },
+            {
+                "start": 125100000,
+                "end": 143200000,
+                "name": "q12",
+                "value": "gvar"
+            },
+            {
+                "start": 143200000,
+                "end": 147500000,
+                "name": "q21.1",
+                "value": "gneg"
+            },
+            {
+                "start": 147500000,
+                "end": 150600000,
+                "name": "q21.2",
+                "value": "gpos"
+            },
+            {
+                "start": 150600000,
+                "end": 155100000,
+                "name": "q21.3",
+                "value": "gneg"
+            },
+            {
+                "start": 155100000,
+                "end": 156600000,
+                "name": "q22",
+                "value": "gpos"
+            },
+            {
+                "start": 156600000,
+                "end": 159100000,
+                "name": "q23.1",
+                "value": "gneg"
+            },
+            {
+                "start": 159100000,
+                "end": 160500000,
+                "name": "q23.2",
+                "value": "gpos"
+            },
+            {
+                "start": 160500000,
+                "end": 165500000,
+                "name": "q23.3",
+                "value": "gneg"
+            },
+            {
+                "start": 165500000,
+                "end": 167200000,
+                "name": "q24.1",
+                "value": "gpos"
+            },
+            {
+                "start": 167200000,
+                "end": 170900000,
+                "name": "q24.2",
+                "value": "gneg"
+            },
+            {
+                "start": 170900000,
+                "end": 173000000,
+                "name": "q24.3",
+                "value": "gpos"
+            },
+            {
+                "start": 173000000,
+                "end": 176100000,
+                "name": "q25.1",
+                "value": "gneg"
+            },
+            {
+                "start": 176100000,
+                "end": 180300000,
+                "name": "q25.2",
+                "value": "gpos"
+            },
+            {
+                "start": 180300000,
+                "end": 185800000,
+                "name": "q25.3",
+                "value": "gneg"
+            },
+            {
+                "start": 185800000,
+                "end": 190800000,
+                "name": "q31.1",
+                "value": "gpos"
+            },
+            {
+                "start": 190800000,
+                "end": 193800000,
+                "name": "q31.2",
+                "value": "gneg"
+            },
+            {
+                "start": 193800000,
+                "end": 198700000,
+                "name": "q31.3",
+                "value": "gpos"
+            },
+            {
+                "start": 198700000,
+                "end": 207100000,
+                "name": "q32.1",
+                "value": "gneg"
+            },
+            {
+                "start": 207100000,
+                "end": 211300000,
+                "name": "q32.2",
+                "value": "gpos"
+            },
+            {
+                "start": 211300000,
+                "end": 214400000,
+                "name": "q32.3",
+                "value": "gneg"
+            },
+            {
+                "start": 214400000,
+                "end": 223900000,
+                "name": "q41",
+                "value": "gpos"
+            },
+            {
+                "start": 223900000,
+                "end": 224400000,
+                "name": "q42.11",
+                "value": "gneg"
+            },
+            {
+                "start": 224400000,
+                "end": 226800000,
+                "name": "q42.12",
+                "value": "gpos"
+            },
+            {
+                "start": 226800000,
+                "end": 230500000,
+                "name": "q42.13",
+                "value": "gneg"
+            },
+            {
+                "start": 230500000,
+                "end": 234600000,
+                "name": "q42.2",
+                "value": "gpos"
+            },
+            {
+                "start": 234600000,
+                "end": 236400000,
+                "name": "q42.3",
+                "value": "gneg"
+            },
+            {
+                "start": 236400000,
+                "end": 243500000,
+                "name": "q43",
+                "value": "gpos"
+            },
+            {
+                "start": 243500000,
+                "end": 248956422,
+                "name": "q44",
+                "value": "gneg"
+            }
+        ],
+        "name": "chr1"
+    },
+    {
+        "bands": [
+            {
+                "start": 0,
+                "end": 4400000,
+                "name": "p25.3",
+                "value": "gneg"
+            },
+            {
+                "start": 4400000,
+                "end": 6900000,
+                "name": "p25.2",
+                "value": "gpos"
+            },
+            {
+                "start": 6900000,
+                "end": 12000000,
+                "name": "p25.1",
+                "value": "gneg"
+            },
+            {
+                "start": 12000000,
+                "end": 16500000,
+                "name": "p24.3",
+                "value": "gpos"
+            },
+            {
+                "start": 16500000,
+                "end": 19000000,
+                "name": "p24.2",
+                "value": "gneg"
+            },
+            {
+                "start": 19000000,
+                "end": 23800000,
+                "name": "p24.1",
+                "value": "gpos"
+            },
+            {
+                "start": 23800000,
+                "end": 27700000,
+                "name": "p23.3",
+                "value": "gneg"
+            },
+            {
+                "start": 27700000,
+                "end": 29800000,
+                "name": "p23.2",
+                "value": "gpos"
+            },
+            {
+                "start": 29800000,
+                "end": 31800000,
+                "name": "p23.1",
+                "value": "gneg"
+            },
+            {
+                "start": 31800000,
+                "end": 36300000,
+                "name": "p22.3",
+                "value": "gpos"
+            },
+            {
+                "start": 36300000,
+                "end": 38300000,
+                "name": "p22.2",
+                "value": "gneg"
+            },
+            {
+                "start": 38300000,
+                "end": 41500000,
+                "name": "p22.1",
+                "value": "gpos"
+            },
+            {
+                "start": 41500000,
+                "end": 47500000,
+                "name": "p21",
+                "value": "gneg"
+            },
+            {
+                "start": 47500000,
+                "end": 52600000,
+                "name": "p16.3",
+                "value": "gpos"
+            },
+            {
+                "start": 52600000,
+                "end": 54700000,
+                "name": "p16.2",
+                "value": "gneg"
+            },
+            {
+                "start": 54700000,
+                "end": 61000000,
+                "name": "p16.1",
+                "value": "gpos"
+            },
+            {
+                "start": 61000000,
+                "end": 63900000,
+                "name": "p15",
+                "value": "gneg"
+            },
+            {
+                "start": 63900000,
+                "end": 68400000,
+                "name": "p14",
+                "value": "gpos"
+            },
+            {
+                "start": 68400000,
+                "end": 71300000,
+                "name": "p13.3",
+                "value": "gneg"
+            },
+            {
+                "start": 71300000,
+                "end": 73300000,
+                "name": "p13.2",
+                "value": "gpos"
+            },
+            {
+                "start": 73300000,
+                "end": 74800000,
+                "name": "p13.1",
+                "value": "gneg"
+            },
+            {
+                "start": 74800000,
+                "end": 83100000,
+                "name": "p12",
+                "value": "gpos"
+            },
+            {
+                "start": 83100000,
+                "end": 91800000,
+                "name": "p11.2",
+                "value": "gneg"
+            },
+            {
+                "start": 91800000,
+                "end": 93900000,
+                "name": "p11.1",
+                "value": "acen"
+            },
+            {
+                "start": 93900000,
+                "end": 96000000,
+                "name": "q11.1",
+                "value": "acen"
+            },
+            {
+                "start": 96000000,
+                "end": 102100000,
+                "name": "q11.2",
+                "value": "gneg"
+            },
+            {
+                "start": 102100000,
+                "end": 105300000,
+                "name": "q12.1",
+                "value": "gpos"
+            },
+            {
+                "start": 105300000,
+                "end": 106700000,
+                "name": "q12.2",
+                "value": "gneg"
+            },
+            {
+                "start": 106700000,
+                "end": 108700000,
+                "name": "q12.3",
+                "value": "gpos"
+            },
+            {
+                "start": 108700000,
+                "end": 112200000,
+                "name": "q13",
+                "value": "gneg"
+            },
+            {
+                "start": 112200000,
+                "end": 118100000,
+                "name": "q14.1",
+                "value": "gpos"
+            },
+            {
+                "start": 118100000,
+                "end": 121600000,
+                "name": "q14.2",
+                "value": "gneg"
+            },
+            {
+                "start": 121600000,
+                "end": 129100000,
+                "name": "q14.3",
+                "value": "gpos"
+            },
+            {
+                "start": 129100000,
+                "end": 131700000,
+                "name": "q21.1",
+                "value": "gneg"
+            },
+            {
+                "start": 131700000,
+                "end": 134300000,
+                "name": "q21.2",
+                "value": "gpos"
+            },
+            {
+                "start": 134300000,
+                "end": 136100000,
+                "name": "q21.3",
+                "value": "gneg"
+            },
+            {
+                "start": 136100000,
+                "end": 141500000,
+                "name": "q22.1",
+                "value": "gpos"
+            },
+            {
+                "start": 141500000,
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+]
\ No newline at end of file