fig3
![Metabolic targets in cardiac aging and rejuvenation](https://image.oaes.cc/0a0eb27d-0961-4326-aaa7-feab5abf5ca4/5155.fig.3.jpg)
Figure 3. Biosynthesis of NAD+. Trp: Tryptophan; NaMN: nicotinic acid mononucleotide; NMNAT: nicotinamide mononucleotide adenyltransferase; NaAD: nicotinic acid dinucleotide; NADS: NAD synthase; NAM: nicotinamide; NR: nicotinamide riboside; NAMPT: nicotinamide phosphoribosyltransferase; NRK: nicotinamide riboside kinase; NMN: nicotinamide mononucleotide.