#index
The major histocompatibility complex (MHC) is an extended genetic region found in jawed vertebrates that encodes, among a wide range of other molecules, the MHC glycoproteins, which include two major classes, MHC-I and MHC-II.

位于脊椎动物某一染色体上的一组紧密连锁的基因群，其产物是APC和T细胞活化的关键

人类的MHC通常又称为HLA（human leucocyte Antigen）基因复合物。【有争议】