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'''Nicotinamidi adeninique dinucleotidum''' (abbreviatura: '''NAD''') est [[cofactor (biochemia)|cofactor]] omnibus [[cellula|cellulis]] vivis inventus. Pars nominis ''dinucleotidi'' indicat, ut compositum hoc organicum ex duobus [[nucleotidum|nucleotidis]] compositum sit - per greges [[phosphatum|phosphati]] suos ligatum. Utrumque autem nucleotidum diversum est: altero [[adeninum]] [[nucleobasisnicotinamidum]] est, altero [[nicotinamidumadeninum]] [[nucleobasis]]. Causa [[electron]]a transferendi nicotinamidi adeninique dinucleotido duae formae sunt: oxydata (abbreviatura: '''NAD<sup>+</sup>''', materia oxydans) et reducta ('''NADH''', materia reducens, electrona dans).
 
Synthesis ''de novo'' ab [[tryptophanum|tryptophano]] vel [[acidum asparticum|acido aspartico]] [[aminoacidum|aminoacidis]] oritur.