CLOSE WINDOW TO RETURN Fig. 1. Origins of synaptic genes. (A) Homologues of genes in the human synaptic complex were identified in the genomes of selected organisms representing key phylogenetic steps in animal evolution. Colors indicate the inferred ancestor of origin for each gene, as indicated in B. (B) Evolutionary relationships among animal phyla. The names of representative species are shown. © Conaco, Bassett et al. (2012), Proc. Natl. Acad. Sci. USA. CLOSE WINDOW TO RETURN