Additional Figure 1(Mao et al., submitted 2005). Permutation test on GO functional groups. For each functional group, a two sample t-test was carried out, testing for a difference in expression for genes associated with this functional group, compared to all other observed gene expression levels. Results are shown for the distribution of p-values (y-axis) for all functional groups in astrocyte, cerebellum, cerebrum, and heart (x-axis). Data from 100 random shuffles of the observed gene expression values are indicated ( 100 black lines); the original data are indicated (red line in each panel). 

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