Fig. 2

Median joining network of MC1R haplotypes in Nigerian, Polynesian, Asian and European pigs. All known haplotypes are represented by circles. Colors inside the circles indicate the type and nomenclature as follows [13, 14]: brown (E⁺ European and Asian—wild type); yellow Nigerian indigenous pigs (NIP); red (e—recessive red—European); black and white (E^P—spotted black—European); and black (E^D2 and E^D1—dominant black—European, Polynesian and Asian). Differences in sequences are noted on each of the branches and the small dash lines represent the number of steps. Red ticks perpendicular to each branch represent non-synonymous mutations that change the protein sequence. Note: red diamond symbols represent intermediate haplotypes