geenide kompleks, mis kontrollib rakupinnal olevate koesobivusantigeenide ekspressiooni ja võimet esile kutsuda immuunvastust, The major histocompatibility complex (MHC) is a set of cell surface proteins essential for the acquired immune system to recognize foreign molecules in vertebrates, which in turn determines histocompatibility. The human MHC is also called the HLA (human leukocyte antigen) complex (often just the HLA). The mouse MHC is called the H-2 complex or H-2.