diff --git a/public/index.html b/public/index.html
index 3daf701..c333a01 100644
--- a/public/index.html
+++ b/public/index.html
@@ -13,9 +13,10 @@
       var model;
 
 
-      $.get( "json/EBI-9691559.json", function( data ) {
+      $.get( "json/EBI-1202920.json", function( data ) {
         model = new MIModel(data).load().then(function(m) {
-          console.log("model", m);
+          window.m = m;
+
         });
 
       });
diff --git a/src/models/Interaction.js b/src/models/Interaction.js
index f40f6e9..b62d85f 100644
--- a/src/models/Interaction.js
+++ b/src/models/Interaction.js
@@ -4,6 +4,7 @@ Backbone = require('backbone')
 Participants = require('./Participant').Participants
 Features = require('./Feature').Features;
 Links = require('./Link').Links;
+Expand = require('../utils/expand');
 
 _ = require('underscore');
 
@@ -15,6 +16,10 @@ Interaction = Backbone.Model.extend({
     links: new Links()
   },
 
+  expand: function() {
+    Expand(this);
+  },
+
   initialize: function(participants) {
 
 
diff --git a/src/models/Participant.js b/src/models/Participant.js
index 1d4fa5d..1a6fdaa 100644
--- a/src/models/Participant.js
+++ b/src/models/Participant.js
@@ -57,7 +57,15 @@ Participant = Backbone.Model.extend({
 
 Participants = Backbone.Collection.extend({
 
-  model: Participant
+  model: Participant,
+
+  withStoichiometry: function(){
+    filtered = this.filter(function(participant) {
+      return participant.get("stoichiometry") > 1
+    });
+
+    return new Participants(filtered);
+  }
 
 });
 
diff --git a/src/utils/expand.js b/src/utils/expand.js
new file mode 100644
index 0000000..571e09c
--- /dev/null
+++ b/src/utils/expand.js
@@ -0,0 +1,40 @@
+var expand;
+
+
+
+nextAvailableId = function(participants) {
+
+  var ids = participants.map(function(p) {
+    return p.get("id");
+  });
+
+  return Math.max.apply(null, ids) + 1
+};
+
+expand = function(interaction) {
+  participants = interaction.get("participants").withStoichiometry();
+
+  var clones = [];
+
+  participants.each(function(p) {
+
+    for (var i = 0; i < p.get("stoichiometry"); i++) {
+      var clone = p.clone();
+      clone.set("id", nextAvailableId(participants) + i);
+      clone.set("clone?", true);
+      clone.set("fromParticipant", p);
+      interaction.get("participants").add(clone);
+    }
+
+  });
+
+
+  interaction.set("expanded?", true);
+
+  // console.log("returning", interaction);
+
+  return interaction;
+
+}
+
+module.exports = expand;