aging nad diseases therapeutic boosting hallmarks decline
metabolism nicotinamide nad adenine dinucleotide pyridine nucleotide synthesis biosynthesis cells pathway nicotinate adenosine nucleotides nadp nicotinic atp novo phosphate epimerase
nad age mitochondrial metabolism cell deficiency dysfunction related decline dependent figure
lipids aging neurodegeneration keeps shrinking lipid atlasofscience
nad pathway biosynthesis metabolic synthesis mammals routes nmn riboside involved