The median-joining network (a) and geographic distribution (b) of the Zp3 coding haplotypes. Numbering of mutations follows the full coding sequence of the bovine Zp3 gene (from base 1 to 1266). The 6-bp insertion (or two-codon repeat) is located at the relative positions between 609 and 620 or between 603 and 604. Nonsynonymous mutations are shown in bold and italic. The size of each circle is proportional to its frequency in numbers of chromosomes. The haplotypes Zp3cdh14 and Zp3cdh15 from the outgroup species are not shown in the geographic map.
Chen et al. BMC Evolutionary Biology 2011 11:24 doi:10.1186/1471-2148-11-24