title: False negative results in patients with fra(X) (q) mental retardation taking oral vitamin supplements.
mesh_terms: D002873:Chromosome Fragility; D005188:False Negative Reactions; D005492:Folic Acid / Q000494:pharmacology*; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D008297:Male
chemical_list: D005492:Folic Acid