Figure 2. NAD+ biosynthetic pathways in mammals.
Naming derives from mammalian abbreviations. NA: nicotinic acid; NR: NAM riboside; NAM: nicotinamide; NAM NMN: NAM mononucleotide; NaMN: nicotinic acid mononucleotide; NaAD: nicotinic acid adenine dinucleotide; QPT: nicotinic acid phosphoribosyl-transferase; NRK: NAM riboside kinase; ART: ADP-ribosyl transferase; PARP: poly-ADP-polymerase; Nampt: NAM phosphoribosyltransferase; PNP: purine nucleoside phosphorylase; NMNAT: NMN/NaMN adenylyltransferase.