Immunogen sequence: LFNLYMSKLE KMQEACGSKS VYDGPEQEEY STFVIDDPQE TYKTLKQVIA GVGALEQEHA QYKRDKFKKT KYGSQE. Human GAP1-InsP4 BP, also designated Ras p21 protein activator (GTPase-activating protein) 3 [Ins(1,3,4,5)P4-binding protein], is an 829-amino acid p