title: Defective vitamin B 12 metabolism in the human being: changes in methionine and methylmalonic acid excretion.
mesh_terms: D000596:Amino Acids / Q000652:urine; D000818:Animals; D001921:Brain / Q000378:metabolism; D003067:Coenzymes / Q000096:biosynthesis; D006710:Homocysteine / Q000378:metabolism; D006711:Homocystine / Q000652:urine; D006801:Humans; D007223:Infant; D008297:Male; D008314:Malonates / Q000652:urine*; D008659:Metabolic Diseases / Q000378:metabolism*; D008715:Methionine / Q000097:blood / Q000378:metabolism*; D051381:Rats; D014805:Vitamin B 12 / Q000378:metabolism*
chemical_list: D000596:Amino Acids; D003067:Coenzymes; D008314:Malonates; D006710:Homocysteine; D006711:Homocystine; D008715:Methionine; D014805:Vitamin B 12