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Nicotinamide adenine dinucleotide (NAD⁺) is a universal coenzyme found in all living cells. It serves as a central redox carrier and a substrate for key enzymatic families including sirtuins and PARPs. NAD⁺ plays a foundational role in mitochondrial function, cellular signaling, and metabolic regulation. Its influence spans processes related to energy production, oxidative balance, genomic stability, and cellular adaptation to stress.
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