title: Biosynthesis of porphyrins and related macrocycles. Part 10. Vitamin B12: biochemical derivation of cobyrinic acid from uroporphyrinogen III. Studies with corresponding ring c methyl heptacarboxylic prophyrinogen, and proof of seven intact methyl transfers.
mesh_terms: D008745:Methylation; D011165:Porphyrinogens / Q000378:metabolism*; D011166:Porphyrins / Q000096:biosynthesis*; D011424:Propionibacterium / Q000378:metabolism; D014577:Uroporphyrinogens / Q000378:metabolism*; D014805:Vitamin B 12 / Q000031:analogs & derivatives / Q000096:biosynthesis*
chemical_list: D011165:Porphyrinogens; D011166:Porphyrins; D014577:Uroporphyrinogens; D014805:Vitamin B 12