Fig. (3).

Numbers of OR genes identified from the whole genome sequences of various organisms [28, 43, 49]. The numbers in the bar graphs indicate those of intact genes, truncated genes, and pseudogenes. The fraction of pseudogenes (P%) in each species was computed from the number of pseudogenes divided by the total number of OR genes. Here we assume that all of the intact and truncated genes are functional for the calculation of P%. However, because some truncated genes may actually be pseudogenes, P% is inaccurate for the species with a low-coverage genome (i.e., the species having a large number of truncated genes). A yellow box indicates five haplorhine species with deep-coverage genomes (see the main text).