is synthetic protein mutant of in taxon HLA-DRA*01:01/DRB1*03:01 protein complex mutant human MHC class II protein complex HLA-DRA*01:01/DRB1*03:01 Q74R mutant protein complex HLA-DRA*0101/DRB1*0301 Q74R mutant HLA-DRA*01:01/DRB1*03:01 Q74R mutant HLA-DRA0101/DRB10301 Q74R mutant HLA-DRA01:01/DRB103:01 Q74R mutant HLA-DRA1*0101/DRB1*0301 Q74R mutant HLA-DRB1*03:01 Q74R mutant Q74R complete molecule human