anchor.diff:                              </select>
                           </td>
                           <td>
  -                            <span>Sort By: </span>
  +                            <span>Sort by: </span>
                               <select id="sort_by" style="width: 200px;">
  -                                <option selected="selected" value="genes">gene data</option>
  +                                <option value="genes">gene data</option>
                                   <option value="clinical" disabled>clinical data</option>
                                   <option value="alphabetical">alphabetically by case id</option>
                                   <option value="custom">user-defined case list / default</option>
  
positive.code: 
                  var geneDataColl = new GeneDataColl({
                      cancer_study_id: cancer_study_id_selected,
                      genes: GeneSet(gene_list).getAllGenes().join(" "),
                      case_list: cases,
                      genetic_profiles: genetic_profiles,
                      z_score_threshold: zscore_threshold,
  
negative.code:                     select_clinical_attributes.prop('disabled', enable_disable).trigger("liszt:updated");
                      zoom.attr('disabled', enable_disable);
                      sortBy.prop('disabled', enable_disable).trigger("liszt:updated");
                  };
  
                  // handler for when user selects a clinical attribute to visualization
  