diff --git a/browser/js/clone.js b/browser/js/clone.js
index 64f8616a0842785211a0c8aefbbad41e1bcfbf64..0b23edca6997ed8d0d006a89d2d5521af1931773 100644
--- a/browser/js/clone.js
+++ b/browser/js/clone.js
@@ -112,7 +112,7 @@ Clone.prototype = {
      * @t : tracking point (default value : current tracking point)
      * */
     getSize: function (time) {
-        time = typeof time !== 'undefined' ? time : this.m.t;
+        time = this.m.getTime(time)
 
         if (this.m.reads.segmented[time] == 0 ) return 0
         var result = this.getReads(time) / this.m.reads.segmented[time]
@@ -124,7 +124,7 @@ Clone.prototype = {
     
     //special getSize for scatterplot (ignore constant)
     getSize2: function (time) {
-        time = typeof time !== 'undefined' ? time : this.m.t;
+        time = this.m.getTime(time)
         
         if (this.m.reads.segmented[time] == 0 ) return 0
         var result = this.getReads(time) / this.m.reads.segmented[time]
@@ -139,13 +139,12 @@ Clone.prototype = {
      * use scientific notation if neccesary
      * */
     getStrSize: function (time) {
-        time = typeof time !== 'undefined' ? time : this.m.t;
-        var size = this.getSize(time);
+        var size = this.getSize(this.m.getTime(time));
         return this.m.formatSize(size, true)
     },
     
     getSystemSize: function (time) {
-        time = typeof time !== 'undefined' ? time : this.m.t;
+        time = this.m.getTime(time)
         
         var system_reads = this.m.reads.segmented[time]
         if (this.germline in this.m.reads.germline) system_reads = this.m.reads.germline[this.germline][time]
@@ -159,16 +158,68 @@ Clone.prototype = {
     },
     
     getStrSystemSize: function (time) {
-        time = typeof time !== 'undefined' ? time : this.m.t;
+        time = this.m.getTime(time)
         var size = this.getSystemSize(time);
         return this.m.formatSize(size, true)
     },
+
+
+    /* Ratio relative to the system group */
+    getSystemGroupSize: function (time) {
+        var group_reads = this.m.systemGroupSize(this.germline, this.m.getTime(time))
+
+        if (group_reads == 0 ) return 0 ;
+        var result = this.getReads(time) / group_reads
+        if (this.norm) result = this.normalize(result, time)
+        return result
+
+    },
+
+    getStrSystemGroupSize: function (time) {
+        time = this.m.getTime(time)
+        var size = this.getSystemGroupSize(time)
+        return this.m.formatSize(size, true)
+    },
+
+    /* return a printable size such as either '26.32%' or '26.32% (33.66% of IGH)' (when there are several systems) */
+    getPrintableSize: function (time) {
+
+        var size = this.getReads(time)
+        s = size + ' read' + (size > 1 ? 's' : '') + ' '
+
+        s += '('
+        s += this.getStrSize(time)
+
+        if (this.m.system_available.length>1) {
+
+            systemGroup = this.m.systemGroup(this.germline)
+            if (systemGroup.indexOf('/') > -1) // if the system group has more than one germline
+            {
+                s += ', '
+                s += this.getStrSystemGroupSize(time) + ' of ' + systemGroup
+            }
+
+            s += ', '
+            s += this.getStrSystemSize(time) + ' of ' + this.germline
+        }
+
+        s += ')'
+        return s
+    },
+
+    getFasta: function() {
+        fasta = ''
+        fasta += '>' + this.getCode() + '    ' + this.getPrintableSize() + '\n'
+        fasta += this.getSequence() + '\n'
+
+        return fasta
+    },
     
     /* 
      *
      * */
     getSequenceSize: function (time) {
-        time = typeof time !== 'undefined' ? time : this.m.t;
+        time = this.m.getTime(time)
         
         if (this.m.reads.segmented[time] == 0 ) return 0
         var result = this.getSequenceReads(time) / this.m.reads.segmented[time]
@@ -186,7 +237,7 @@ Clone.prototype = {
      * @t : tracking point (default value : current tracking point)
      * */
     getReads: function (time) {
-        time = typeof time !== 'undefined' ? time : this.m.t;
+        time = this.m.getTime(time)
         var result = 0;
 
         var cluster = this.m.clusters[this.hash]
@@ -202,7 +253,7 @@ Clone.prototype = {
      *
      * */
     getSequenceReads: function (time) {
-        time = typeof time !== 'undefined' ? time : this.m.t;
+        time = this.m.getTime(time)
         return this.reads[time];
 
     }, //end getSequenceSize
diff --git a/browser/js/export.js b/browser/js/export.js
index ba908cff37c179d3e7cb312fb1fdac237ae286be..0063ddd945f2546edb0d56d343605606b81761c6 100644
--- a/browser/js/export.js
+++ b/browser/js/export.js
@@ -474,20 +474,10 @@ Report.prototype = {
             var reads_stats = $('<span/>', {'class': 'clone_table'}).appendTo(clone);
             for (var i=0; i<m.samples.order.length; i++){
                 var t = m.samples.order[i]
-                $('<span/>', {'text': m.clone(cloneID).getStrSize(t)+'\u00a0', 'class': 'clone_value'}).appendTo(reads_stats);
-            }
-            if (m.system_available.length>1){
-                var reads_system_stats = $('<span/>', {'class': 'clone_table'}).appendTo(clone);
-                for (var i=0; i<m.samples.order.length; i++){
-                    var t = m.samples.order[i]
-                    $('<span/>', {'text': m.clone(cloneID).getStrSystemSize(t)+'\u00a0', 'class': 'clone_value'}).appendTo(reads_system_stats);
-                }
+                $('<span/>', {'text': m.clone(cloneID).getPrintableSize(t)+'\u00a0', 'class': 'clone_value'}).appendTo(reads_stats);
             }
         }else{
-            if (m.system_available.length>1){
-                $('<span/>', {'text': '('+m.clone(cloneID).getStrSystemSize(time)+' of '+system+')\u00a0', 'class': 'float-right'}).appendTo(head);
-            }
-            $('<span/>', {'text': m.clone(cloneID).getStrSize(time)+'\u00a0', 'class': 'float-right'}).appendTo(head);
+            $('<span/>', {'text': m.clone(cloneID).getPrintableSize(time)+'\u00a0', 'class': 'float-right'}).appendTo(head);
         }
         
         //colorized clone sequence
diff --git a/browser/js/model.js b/browser/js/model.js
index 6fc1d4cd836d12f5fadf4f027bfde17275470744..b3b340f2f7910c275f57518f33177dfd063faf9b 100644
--- a/browser/js/model.js
+++ b/browser/js/model.js
@@ -702,6 +702,10 @@ Model.prototype = {
         this.initClones();
     },
 
+    getTime: function(time) {
+        return typeof time !== 'undefined' ? time : this.t
+    },
+
     /**
      * return a name that can be displayed gracefully
      * (either with a real filename, or a name coming from the database).
@@ -1802,8 +1806,7 @@ Model.prototype = {
             
             var fasta = '<pre>'
             for (var i=0; i<list.length; i++){
-                fasta += '>' + this.clone(list[i]).getCode() + '\n'
-                fasta += this.clone(list[i]).getSequence() + '\n'
+                fasta += this.clone(list[i]).getFasta() + '\n'
             }
             
             var result = $('<div/>', {
@@ -1833,7 +1836,7 @@ Model.prototype = {
     },
     
     systemSize: function(system, time) {
-        time = typeof time !== 'undefined' ? time : this.t;
+        time = this.getTime(time)
         if (typeof this.reads.germline[system] != 'undefined'){
             return this.reads.germline[system][time]/this.reads.segmented[time]
         }else{
@@ -1845,6 +1848,45 @@ Model.prototype = {
         }
         
     },
+
+
+    /* Two systems are in the same group when then only differs by '+' */
+
+    sameSystemGroup: function(system1, system2) {
+        system1 = system1.replace('+', '')
+        system2 = system2.replace('+', '')
+        return (system1 == system2)
+    },
+
+    /* Representation of a system group, such as 'TRD/TRD+' */
+
+    systemGroup: function(system) {
+        list = ''
+        for (var germline in this.reads.germline) {
+            if (this.sameSystemGroup(germline, system)) {
+                if (list) list += '/'
+                list += germline
+            }
+        }
+        return list
+    },
+
+    /* Returns the number of reads of a given system group at a given time */
+
+    systemGroupSize: function(system, time) {
+        time = this.getTime(time)
+        reads = 0
+
+        for (var germline in this.reads.germline) {
+            if (this.sameSystemGroup(germline, system)) {
+                reads += this.reads.germline[germline][time]
+            }
+        }
+
+        return reads
+    },
+
+
     
     wait: function(text){
         document.getElementById("waiting_screen").style.display = "block";