Expression in the cortical regions vs. expression in the subcortical regions. Shown is the mean number of cortical brain regions in which a gene is highly expressed (presented on the y-axis), given the number of subcortical brain regions in which the same gene is highly expressed (x-axis). Genes that are highly expressed in more subcortical regions tend to be highly expressed in more cortical regions.
Tuller et al. Genome Biology 2008 9:R142 doi:10.1186/gb-2008-9-9-r142