Minimum numbers of putative MHC class Ia loci in amphibian species. The simplified phylogenetic tree of amphibian species with a deduced number of MHC class Ia loci is based on the amphibian pedigree shown in . The putative number of loci is shown above the corresponding branches.
Zhao et al. BMC Evolutionary Biology 2013 13:113 doi:10.1186/1471-2148-13-113