Supplementary results. List of genes corresponding to over-represented GO terms in REB, MREB and PS genes in the different avian lineages. Number of genes identified as positively selected in mammals or as evolving faster in mammals than in other lineages of the amniotes. List of positively selected genes in zebra finch lineage whose human orthologs have been implicated in neurological function (learning, neurogeneration, neurodegeneration). Rate of divergence at fourfold degenerate sites (×10-9 site-1 year-1) in Eutherinan lineages. Phylogenetic tree showing the relationship among the species used in the study. Venn diagrams showing for zebra finch, chicken and the ancestral bird lineage the number of REB, MREB, and PS genes.