The gene responsible for familial hypocalciuric hypercalcemia maps to chromosome 3 q in four unrelated families. - Chou,Y.H.; Brown,E.M.; Levi,T.; Crowe,G.; Atkinson,A.B.; Arnqvist,H.J.; Toss,G.; Fuleihan,G.E.; Seidman,J.G.; Seidman,C.E. (Nat Genet, 1992)