title: Neurofibromatosis: variable expression is not intrinsic to the mutant gene.
mesh_terms: D002648:Child; D004200:Diseases in Twins; D005260:Female; D005817:Genetic Counseling; D014644:Genetic Variation; D006801:Humans; D009154:Mutation; D009456:Neurofibromatosis 1 / Q000235:genetics*; D010641:Phenotype; D011247:Pregnancy; D012008:Recurrence; D012306:Risk; D014430:Twins, Monozygotic