Distribution of tissue-specificity in paralogs compared to an outgroup ortholog.

For each graph, paralogs of a given phylogenetic age are compared to the closest outgroup un-duplicated ortholog; thus these paralogs are "in-paralogs" relative to the speciation node, and are both "co-orthologs" to the outgroup. X-axis, τ of unduplicated ortholog. Y-axis, τ of paralogs. Blue points are values for the paralog with highest maximal expression of the pair of paralogs, orange points are values for the other.