"a family of fifty or more genes on the sixth human chromosome that code for proteins on the surfaces of cells and that play a role in the immune response"@en-us . . "0"^^ . . . . "histocompatibility complex"^^ . . . . "08007204-n"^^ . "108007204"^^ . . "histocompatibility complex"@en-us . . "0"^^ .