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Nicotinamide adenine dinucleotide, abbreviated NAD+, is a coenzyme found in all living cells. Nicotinamide adenine dinucleotide, like all dinucleotides, consists of two nucleotides joined by a pair of bridging phosphate groups. — “Nicotinamide adenine dinucleotide - Wikipedia, the free”, en.wikipedia.org
In biochemistry, flavin adenine dinucleotide (FAD) is a redox cofactor involved in several important reactions in metabolism. Thus, riboflavin is not technically a nucleotide; the name flavin adenine dinucleotide is a misnomer.. — “FAD - Wikipedia, the free encyclopedia”, en.wikipedia.org
However, two B vitamins, niacin and riboflavin, bind with adenine to form the essential cofactors nicotinamide adenine dinucleotide (NAD) and flavin adenine dinucleotide (FAD), respectively. Hermann Emil Fischer was one of the early scientists to study adenine. — “Adenine - Wikipedia, the free encyclopedia”, en.wikipedia.org