nad biosynthesis pathway metabolic synthesis mammals routes nam nmn riboside
acid nicotinic nad nicotinamide metabolic pathways nam riboside mononucleotide ribose mammalian synthesis adenine dinucleotide adp
nad synthesis pathways pathway salvage vitamins aging
nadph mitochondrial metabolic cytosolic nadp shuttle cytosol g6pd mitochondria pathway phosphate glucose malate pentose idh2 dehydrogenase ribose glud isocitrate nicotinamide
nad biosynthesis pathway pathways aspartate tryptophan enzyme