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Definition of MAJOR HISTOCOMPATIBILITY COMPLEX. : a group of genes in mammals that code for cell-surface polymorphic glycoprotein molecules which display antigenic peptide fragments for T cell recognition and aid in the ability of the immune system to determine self from nonself. ADVERTISEMENT.edical Definition of MAJOR HISTOCOMPATIBILITY COMPLEX. : a group of genes in mammals that function especially in determining the histocompatibility antigens found on cell surfaces and that in humans comprise the alleles occurring at four loci on the short arm of chromosome 6âabbreviation MHC.
The major histocompatibility complex (MHC) is a set of cell surface molecules encoded by a large gene family which controls a major part of the immune system in all vertebrates.lass II MHC molecules have no Î²2 subunits so can be recognised by CD4 co-receptors. In this way MHC molecules chaperones which type of lymphocytes may bind to the given antigen with high affinity, since different lymphocytes express different TCR co-receptors.