title: Biosynthesis of porphyrins and related macrocycles. Part 9. Biosynthesis of the corrin macrocycle of vitamin B12 including the sterochemistry of C-methylation in ring.
mesh_terms: D008745:Methylation; D011166:Porphyrins / Q000096:biosynthesis*; D011424:Propionibacterium / Q000378:metabolism; D013237:Stereoisomerism; D014805:Vitamin B 12 / Q000096:biosynthesis*
chemical_list: D011166:Porphyrins; D014805:Vitamin B 12