Figure 2

Tissue specificity measured by relative entropy. (a) Tissue specificity correlation between EST and CAGE data sources, measured as the mean relative entropy in each of the nine gene sets. Standard error bars for CAGE (red) and EST (blue) are shown. The plots of the six tissue-specific sets are distinct from the three ubiquitously expressed sets. (b) Tissue specificity correlation between EST and CAGE data sources, using the tissue specificity (relative entropy) of individual genes in each set. Spearman correlation coefficients and associated P values rejecting the null hypothesis (no correlation) are shown in Table 1. CAGE, cap analysis of gene expression; EST, expressed sequence tag.