anchor.diff:  						
   						//enable disable lead IND
   						if(event.target.value == 'OTHER'){
  -						  	createStudy.addIND(index, 0, 2,function(html){
  +						  	if (INDs > 0) return;
  +                            createStudy.addIND(index, 0, 2,function(html){
   	     						new Insertion.After($('study.studyAgents[' + index + '].indType-row'), html);
   	     						AE.slideAndShow('study.studyAgents[' + index + '].studyAgentINDAssociations[0].investigationalNewDrug-row')
   	     						//setup auto completer
   	    						jsAgents[index].initINDAutoCompleter(0);
  +                                INDs++;
   					     	});
  +
   						}else if(event.target.value == 'CTEP_IND'){
   							createStudy.addIND(index, 0, 1,function(html){
   								var el = $('study.studyAgents[' + index + '].studyAgentINDAssociations[0].investigationalNewDrug-row')
  
positive.code: 	}
  	  
  	var jsStudyAgent = Class.create();
  	Object.extend(jsStudyAgent.prototype, {
              initialize: function(index, agentName) {
              	jsAgents[index] = this;
  
negative.code:             		this.indSelector.bind(this)
              	  );
                     
              },
              agentPopulator: function(autocompleter, text) {
           		createStudy.matchAgents(text, function(values) {
           			autocompleter.setChoices(values)
           		})
  