anchor.diff:  </table>
   
   <c:forEach var="experimentalFactor" items="${differentiallyExpressedFactors}" varStatus="i" begin="6">
  -    <c:if test="${ef==null}">
  +    <c:if test="${empty ef}">
           <div class="geneAnnotHeader">${f:escapeXml(atlasProperties.curatedEfs[experimentalFactor.name])}</div>
       </c:if>
       studied in
       <c:forEach var="experiment" items="${experimentalFactor.experiments}" varStatus="i_e">
  -        <c:if test="${(i_e.index<5)||(ef!=null)}">
  +        <c:if test="${(i_e.index<5)||(not empty ef)}">
               <a href="${pageContext.request.contextPath}/experiment/${experiment}/${atlasGene.geneIdentifier}">${experiment}</a><c:if
                   test="${!i_e.last}">, </c:if>
           </c:if>
           <c:if test="${i_e.last}">
  -            <c:if test="${(i_e.count>=5)&&(ef==null)}">
  +            <c:if test="${(i_e.count>=5)&&(empty ef)}">
                   ... (${i_e.count} experiments)
               </c:if>
           </c:if>
       </c:forEach>
  -    <c:if test="${ef==null}">
  +    <c:if test="${empty ef}">
           <div style="font-size:10px;">
               <a href="${pageContext.request.contextPath}/gene/${atlasGene.geneIdentifier}?ef=${experimentalFactor.name}">show
                   this factor only&gt;&gt;</a>
  
positive.code:             <c:if test='${experimentalFactor.name=="organism_part" && hasAnatomogram}'>
                  <br/>
  
                  <div style="overflow:hidden; <c:if test="${ef==null}">width:300px;</c:if>">
                      <img src="${pageContext.request.contextPath}/<c:if test="${ef==null}">web</c:if>anatomogram/${atlasGene.geneIdentifier}.png"
                           alt="anatomogram" border="none" usemap="#anatomogram"/>
                  </div>
                  <!--
  
negative.code:         </c:if>
  
          <td style="vertical-align:top; padding-right:20px;">
              <c:if test="${empty ef}">
                  <div class="geneAnnotHeader"
                       style="width:200px;">${f:escapeXml(atlasProperties.curatedEfs[experimentalFactor.name])}</div>
              </c:if>
              studied in
              <c:forEach var="experiment" items="${experimentalFactor.experiments}" varStatus="i_e">
                  <c:if test="${(i_e.index<5)||(not empty ef)}">
                      <a href="${pageContext.request.contextPath}/experiment/${experiment}/${atlasGene.geneIdentifier}"
                         title="${experiment}">${experiment}</a><c:if test="${!i_e.last}">, </c:if>
                  </c:if>
                  <c:if test="${i_e.last}">
                      <c:if test="${(i_e.count>=5)&&(empty ef)}">
                          ... (${i_e.count} experiments)
                      </c:if>
                  </c:if>
  