acid nicotinic nad nicotinamide metabolic pathways nam riboside mononucleotide ribose mammalian synthesis adenine dinucleotide adp
metabolism nicotinamide nad adenine dinucleotide pyridine nucleotide basics synthesis biosynthesis pathway nicotinate nucleotides atp adenosine acid nadp nicotinic epimerase electron
nad homeostasis enzymes metabolism modulating biosynthetic degradative therapeutic significance potential
nicotinamide mononucleotide cells biosynthetic mammalian