High Quality Content by WIKIPEDIA articles! HLA-DQ7 (DQ7) is an HLA-DQ serotype that recognizes the common HLA DRB1*0301 and the less common HLA DRB1*0304 gene products. DQ7 is a form of split antigen of the broad antigen group DQ3 which alsoMoreHigh Quality Content by WIKIPEDIA articles! HLA-DQ7 (DQ7) is an HLA-DQ serotype that recognizes the common HLA DRB1*0301 and the less common HLA DRB1*0304 gene products. DQ7 is a form of split antigen of the broad antigen group DQ3 which also contains DQ8 and DQ9.