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Nicotinamide adenine dinucleotide consists of two nucleotides: one nucleotide containing an adenine base, and the other containing nicotinamide, joined by their phosphate groups. NAD+ (the abbreviated deprotonated form of NADH) is a coenzyme found in most cellular organisms. The molecule is important in metabolic oxidation-reduction reactions due to its electron transfer capability of its two forms, NADH (reduced form) and NAD+ (oxidized form).

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