Mean pairwise Z score distributions: five highly affected and one unaffected gene group. The distribution of mean Z scores for the five most consistently affected gene groups (see Fig. 1) is shown for each array comparison, along with the mean Z scores for an unaffected gene group, RNA polymerases (RNA Poly). Interestingly, the mean Z score distributions for the five most affected gene groups was highly correlated among seven of the 10 subject pairs (Pearson's R range, 0.77–0.99).Asp/Ala, Aspartate–alanine metabolism;Orn/PA, ornithine–polyamine metabolism.