Present/Marginal/Absent calls For each gene for each array, the Microarray Suite software reported a statistical decision as to whether the mRNA was Present, Marginal, or Absent. We have reviewed these calls for the genes shown in Figures 2,3,4,5. For Figure 2, the Present/Marginal/Absent calls were: Fig. 2 Top: 53/1/0; Fig. 2 Middle: 39/2/13; and Fig. 2 Bottom: 0/0/54. For Figure 3, the calls were: Fig. 3 Top: 45/2/7; Fig. 3 Middle: 7/0/47; and Fig. 3 Bottom: 32/6/16. For Figure 4, the calls were: Fig. 4 Top: 0/0/54; Fig. 4 Middle: 0/0/54; and Fig. 4 Bottom: 51/0/3. For Figure 5, the calls were: Fig. 5 Top: 45/1/8; Fig. 5 Middle: 52/0/2; and Fig. 5 Bottom: 54/0/0.