title: Congenital deficiency of C2 and factor B.
mesh_terms: D002648:Child; D003175:Complement C2 / Q000172:deficiency*; D011415:Complement Factor B / Q000172:deficiency*; D004792:Enzyme Precursors / Q000172:deficiency*; D006801:Humans
chemical_list: D003175:Complement C2; D004792:Enzyme Precursors; D011415:Complement Factor B