title: Are colon bacteria a major source of cobalamin analogues in human tissues? 24-hr human stool contains only about 5 micrograms of cobalamin but about 100 micrograms of apparent analogue (and 200 micrograms of folate).
mesh_terms: D001646:Bile / Q000032:analysis; D001681:Biological Assay; D002851:Chromatography, High Pressure Liquid; D003106:Colon / Q000382:microbiology*; D045728:Corrinoids; D005243:Feces / Q000032:analysis*; D005492:Folic Acid / Q000032:analysis; D005504:Food Analysis; D014805:Vitamin B 12 / Q000031:analogs & derivatives* / Q000032:analysis / Q000096:biosynthesis / Q000652:urine
chemical_list: D045728:Corrinoids; D005492:Folic Acid; D014805:Vitamin B 12