MHC class I histocompatibility antigen alpha chain HLA class I histocompatibility antigen alpha chain (human) HLA class I histocompatibility antigen, alpha chain E (human) HLA-E Category=organism-gene. Requested by=IEDB. HLA-E chain PR:P13747 HLAE An MHC class I histocompatibility antigen, alpha chain E that is encoded in the genome of human. protein hHLA-E MRO:0000769 MHC class I antigen E (human) UniProtKB:P13747 HLA-6.2