>tr|B2RG90|B2RG90_HUMAN MHC class II antigen (Fragment) OS=Homo sapiens OX=9606 GN=HLA-DRB1 PE=4 SV=1 RFLEEVKFECHFFNGTERVRLLERRVHNQEEYARFDSDVGEYRAVTELGRPDAEYWNSQK DLLERRRAAVDTYCRHNYGVGESFTVQRRVQPKVTVYPSKTQPLQHHNLLVCSVNGFYPG SIEVRWFRNGQEEKTGVVSTGLIQNGDWTFQTLVMLETVPQSGEVYTCQVEHPSVMSPLT VEW