title: The pyridine nucleotide cycle and its role in the biosynthesis of ricinine by Ricinus communis L.
mesh_terms: D000470:Alkaloids / Q000096:biosynthesis*; D002247:Carbon Isotopes / Q000378:metabolism; D009243:NAD / Q000378:metabolism*; D009536:Niacinamide / Q000378:metabolism*; D009539:Nicotinic Acids / Q000378:metabolism*; D010947:Plants, Toxic; D011725:Pyridines / Q000096:biosynthesis*; D012278:Ricinus / Q000378:metabolism*
chemical_list: D000470:Alkaloids; D002247:Carbon Isotopes; D009539:Nicotinic Acids; D011725:Pyridines; D009243:NAD; D009536:Niacinamide