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Adenylyltransferase, Nicotinamide-Nucleotide

An enzyme that catalyzes reversibly the Transfer of the adenylyl moiety of ATP to the phosphoryl group of NMN to form NAD+ and pyrophosphate. The enzyme is found predominantly in the nuclei and catalyzes the final reaction in the major pathway for the biosynthesis of NAD in Mammals. EC 2.7.7.1.