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Enables the directed movement of nicotinamide mononucleotide into, out of or within a cell, or between cells. Nicotinamide mononucleotide is a ribonucleotide in which the nitrogenous base, nicotinamide, is in beta-n-glycosidic linkage with the c-1 position of d-ribose. It is a constituent of NAD and NADP. [ISBN:0721662544]
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