title: Histocompatibility restriction explained.
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000502:physiology*; D006649:Histocompatibility Antigens / Q000502:physiology*; D006801:Humans; D011971:Receptors, Immunologic / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006649:Histocompatibility Antigens; D011971:Receptors, Immunologic