Species used for the analysis of conversion events in the five gene clusters. The phylogeny for these species was derived from [53, 54]. Those used for the analysis in each gene cluster are marked with superscripts as follows: aα-globin, bβ-globin, lCCL, iIFN, and cCYP2abf. "*" indicates the seven species for which sequence data was newly generated for the CCL, IFN, and CYP2abf clusters. The human, mouse, cow, dog, and elephant sequences were downloaded from the UCSC Genome Browser, and the other primates from GenBank and Ensembl.