Mutations in fibroblast growth factor receptor 1 cause both Kallmann syndrome and normosmic idiopathic hypogonadotropic hypogonadism. - Pitteloud N; Acierno JS Jr; Meysing A; Eliseenkova AV; Ma J; Ibrahimi OA; Metzger DL; Hayes FJ; Dwyer AA; Hughes VA; Yialamas M; Hall JE; et al. (Proceedings of the National Academy of Sciences of the United States of America, 2006)