>1k2d_A mol:protein length:189 H-2 class II histocompatibility antigen, A-U alpha chain HSRGEDDIEADHVGSYGIVVYQSPGDIGQYTFEFDGDELFYVDLDKKETIWMLPEFAQL RSFDPQGGLQNIATGKHNLGVLTKRSNSTPATNEAPQATVFPKSPVLLGQPNTLICFVD NIFPPVINITWLRNSKSVADGVYETSFFVNRDYSFHKLSYLTFIPSDDDIYDCKVEHWG LEEPVLKHWEPE