Figure 1.

Phylogeny used in the search for the evolutionary origin of human genes. Taxa represented in the databases with complete genomes or a substantial amount of TRACE and expressed sequence tag data are in bold. Taxa in italics are represented in the databases only with small numbers of highly conserved genes: their exclusion from the analysis does not influence the results. The phylogeny is based on the results of the most recent phylogenomic analyses [15-19].