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Alternative pathway to NAD+
5-phospho-α-D-ribose 1-diphosphate biosynthesis
2'-phospho-cyclic-ADP-ribose biosynthesis
EC 2.4.2.12 nicotinamide phosphoribosyltransferase
EC 2.7.1.23 NAD+ kinase
EC 2.7.7.1 nicotinamide-nucleotide adenylyltransferase