title: Homocystinuria associated with decreased methylenetetrahydrofolate reductase activity.
mesh_terms: D000293:Adolescent; D002247:Carbon Isotopes; D003067:Coenzymes / Q000494:pharmacology; D005260:Female; D005347:Fibroblasts / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism; D005492:Folic Acid; D006710:Homocysteine / Q000494:pharmacology; D006712:Homocystinuria / Q000201:enzymology* / Q000378:metabolism; D006801:Humans; D012695:L-Serine Dehydratase / Q000032:analysis; D008297:Male; D008715:Methionine / Q000494:pharmacology; D008745:Methylation; D008780:Methyltransferases / Q000032:analysis; D010088:Oxidoreductases / Q000032:analysis*; D014805:Vitamin B 12 / Q000494:pharmacology
chemical_list: D002247:Carbon Isotopes; D003067:Coenzymes; D006710:Homocysteine; D005492:Folic Acid; D008715:Methionine; D010088:Oxidoreductases; D008780:Methyltransferases; D012695:L-Serine Dehydratase; D014805:Vitamin B 12