anchor.diff:              if ((xData[i] == "NaN") || (yData[i] == "NaN")) {
                   continue;
               }
  -            dataset[index] = [xData[i], yData[i], zData[i], mutations[i]];
  +            dataset[index] = [xData[i], yData[i], zData[i], mutations[i], case_set[i]];
               index += 1;
           }
       } else if (type == 3) {
  
positive.code:                         case mutationTypes[4]: return mutationFillTypes[4];
                          case mutationTypes[5]: return mutationFillTypes[5];
                          case mutationTypes[6]: return mutationFillTypes[6];
                          default: return "none";
                      }
                  })
                  .attr("stroke", function(d) {
  
negative.code:     var yLegend = axisTitles[1];
      var tmp_plot_type = document.getElementById("plot_type").value;
      if (tmp_plot_type == plot_type_list[0][0]) {    //"mrna_vs_copy_no"
          drawScatterPlots(copy_no, mrna, mutations, xLegend, yLegend, 1);
          $('#img_center').empty();
          $('#img_center').append(gene + ": mRNA Expression v. CNA ");
      } else if (tmp_plot_type == plot_type_list[1][0]) {  //"mrna_vs_dna_mythelation"
          drawScatterPlots(dna_methylation, mrna, copy_no, xLegend, yLegend, 2);
          $('#img_center').empty();
          $('#img_center').append(gene + ": mRNA Expression v. DNA Methylation ");
      } else if (tmp_plot_type == plot_type_list[2][0]) {  //"rppa_protein_level_vs_mrna"
          drawScatterPlots(mrna, rppa, copy_no, xLegend, yLegend, 3);
          $('#img_center').empty();
          $('#img_center').append(gene + ": RPPA protein level v. mRNA Expression ");
      }
  