Lineage-specific and shared gene family expansion in amniotes. (A) Gene family expansions along primate, rodent, marsupial, monotreme, and bird lineages are depicted along the tree branches as bar-plots (number of gene families with at least three paralogs, number of “specific,” number of “diverse,” and number of “broad” gene families). (B) Gene families that expanded independently in more than a single lineage, with gene family identifiers depicted above (as in Supplemental Table S1). Color of the cells corresponds to the predominant tissue of expression of each gene family in the given species for “specific” gene families. White cells correspond to “diverse” gene families. The gene family highlighted in red above expanded independently in mouse, opossum, platypus, and chicken; the blue gene family expanded independently in mouse, opossum, and platypus.
