Ancestral polymorphism at the major histocompatibility complex (MHCII ss) in the Nesospiza bunting species complex and its sister species (Rowettia goughensis)
Background: The major histocompatibility complex (MHC) is an important component of the vertebrate immune system and is frequently used to characterise adaptive variation in wild populations due to its co-evolution with pathogens. Passerine birds have an exceptionally diverse MHC with multiple gene copies and large numbers of alleles compared to other avian taxa. The Nesospiza bunting species comp
