The HLA system.
D003718:Denmark; D000939:Epitopes; D005787:Gene Frequency; D006680:HLA Antigens; D006649:Histocompatibility Antigens; D006801:Humans; D007111:Immunity, Cellular; D007959:Lymphocyte Culture Test, Mixed
D000939:Epitopes; D006680:HLA Antigens; D006649:Histocompatibility Antigens