HLA class II histocompatibility antigen, DR alpha chain; HLA class II histocompatibility antigen, DRB1-1 beta chain; Hemagglutinin peptide; superantigen
HLA class II histocompatibility antigen, DR alpha chain; HLA class II histocompatibility antigen, DRB1-1 beta chain; Hemagglutinin peptide; superantigen