major histocompatibility complex
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Related to major histocompatibility complex: human leukocyte antigen
major histocompatibility complex[′mā·jər ¦hi·stō·kəm′pad·ə′bil·əd·ē ′käm‚pleks]
In vertebrates, a family of genes that encode cell surface glycoproteins that regulate interactions among cells of the immune system, some components of the complement system, and perhaps other related functions connected with intercell recognition. Abbreviated MHC.