A distinguishing characteristic of genes that code for the major histocompatibility complex (MHC) is that alleles often share more similarity between. rather than within species. There are two likely mechanisms that can explain this pattern: convergent evolution and trans-species polymorphism (TSP). in which ancient allelic lineages are maintained by balancing selection and retained b... https://parisnaturalfoodes.shop/product-category/ult-digest-enz-immediate/