Figure 2

The scatter plots of the six most strongly correlated receptor pairs (out of the 4950 pairs). Each point represents the mRNA amounts (averaged across the probes and subjects) of the two receptors in one of the 169 brain regions. Considerable clustering is apparent, which indicates that in most brain regions the mRNA levels of the two receptors are either low or high simultaneously, with few regions in between. All correlations are significant at p < 10^-15.