Type of mutation in the neurofibromatosis type 2 gene (NF2) frequently determines severity of disease. - Ruttledge,M.H.; Andermann,A.A.; Phelan,C.M.; Claudio,J.O.; Han,F.Y.; Chretien,N.; Rangaratnam,S.; MacCollin,M.; Short,P.; Parry,D.; Michels,V.; Riccardi,V.M.; et al. (Am J Hum Genet, 1996)