nmn molecule. nicotinamide mononucleotide

nmn molecule nicotinamide mononucleotide precursor nad molecular chemical structural formula model adenine dinucleotide coenzyme metabolism plus redox reactions cellular respiration energy atp synthesis glycolysis krebs cycle oxidative phosphorylation nadh conversion sirtuins aging dna repair mitochondrial function precursors supplement riboside metabolic health immune cell signaling stress neuroprotection biosynthesis scientific diagram healthy medical science biology exam knowledge lesson explainer education biochemistry quiz learning training teaching vector