sequence of MHC class II alpha chain DPA1_HUMAN DP(W3) DP(W4) HLA class II histocompatibility antigen, DP alpha 1 chain HLA-DP HLA-DP1A HLA-DPA1 HLA-SB HLA-SB HISTOCOMPATIBILITY TYPE HLA-SB alpha chain HLADP HLASB IMR:0002512 MAJOR HISTOCOMPATIBILITY COMPLEX, CLASS II, DP ALPHA-1 MHC class II DP3-alpha MHC class II DPA1 PLT1 UniProt:P20036 major histocompatibility complex, class II, DP alpha 1 molecule_role