anchor.diff:  <c:set var="worm" value=""/>
   <c:set var="ncbiftp" value="ftp://ftp.ncbi.nlm.nih.gov"/>
   <c:set var="isPrimer" value="primer"/>
  +<c:set var="wormTracksCounter" value="0"/>
  +<c:set var="flyTracksCounter" value="0"/>
   
     <im:boxarea title="${exp.name}" stylename="gradientbox">
  -
  -<%--NB: We assume that an experiment deals either with one or the other organism.
  -TODO: check if true also with future Henikoff experiments. 
  -TODO: associate organism with experiment (or read tracks) 
  -NBB: for fly freeze, Henikoff has only fly submissions -> the choice
  ---%>
   
     <table cellpadding="0" cellspacing="0" border="0" class="dbsources">
     <tr>
  
positive.code:   <td>
      <c:forEach items="${exp.organisms}" var="organism" varStatus="orgStatus">
        <c:if test="${organism eq 'D. melanogaster'}"> 
          <img border="0" class="arrow" src="model/images/f_vvs.png" title="fly"/><br>
  						<c:set var="fly" value="1" />
  					</c:if>
        <c:if test="${organism eq 'C. elegans' && empty fly}"> <%-- ****** --%> 
          <img border="0" class="arrow" src="model/images/w_vvs.png" title="worm"/><br>
  						<c:set var="worm" value="1" />
  					</c:if>
      </c:forEach> 
  
negative.code:      <c:choose>
       <c:when test="${!empty tracks[exp.name]}">
       <c:set var="urlabels" value=""/>
       <c:set var="flylabels" value=""/>
       <c:set var="wormlabels" value=""/>
  
  All GBrowse tracks generated for this experiment:
  
  