fig4
![Metabolic targets in cardiac aging and rejuvenation](https://image.oaes.cc/0a0eb27d-0961-4326-aaa7-feab5abf5ca4/5155.fig.4.jpg)
Figure 4. Metabolism of NAD+. NAM: Nicotinamide; NMN: nicotinamide mononucleotide; ETC: electron transport chain; TCA: tricarboxylic acid cycle; NAMPT: nicotinamide phosphoribosyltransferase; NR: nicotinamide riboside; PARP: poly(ADP-ribose) polymerase.