>tr|M4QEN3|M4QEN3_HUMAN MHC class II antigen (Fragment) OS=Homo sapiens OX=9606 GN=HLA-DRB1 PE=4 SV=1 RFLWQPKRECHFFNGTERVRFLDRYFYNQEESVRFDSDVGEYRAVTELGRPDAEYWNSQK DLLEDRRAAVDTYCRHNYGVGESFTVQRR