title: Studies on the biosynthesis of NAD by a direct method of tracing metabolism in vivo.
mesh_terms: D000818:Animals; D002247:Carbon Isotopes; D008099:Liver / Q000378:metabolism*; D051379:Mice; D009243:NAD / Q000096:biosynthesis*; D009536:Niacinamide / Q000378:metabolism; D009539:Nicotinic Acids / Q000378:metabolism; D011725:Pyridines / Q000378:metabolism; D014364:Tryptophan / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D009539:Nicotinic Acids; D011725:Pyridines; D009243:NAD; D009536:Niacinamide; D014364:Tryptophan