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. 2018 May 9;200(11):e00785-17. doi: 10.1128/JB.00785-17

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FIG 1 — Previously recognized de novo and salvage pathways for NAD⁺ biosynthesis. Dotted boxes show compounds that can be taken up by the cell. ADPR-PPase, ADP-ribose pyrophosphatase; DHAP, dihydroxyacetone phosphate; Na, nicotinic acid; NaAD, nicotinic acid adenine dinucleotide; NaMN, nicotinic acid mononucleotide; NaMNAT, nicotinic acid mononucleotide adenylyltransferase; NaPRT, nicotinic acid phosphoribosyltransferase; NaR, nicotinic acid riboside; Nm, nicotinamide; NMN, nicotinamide mononucleotide; NMNAT, nicotinamide mononucleotide adenylyltransferase; NmPRT, nicotinamide phosphoribosyltransferase; NmR, nicotinamide riboside; PRPP, phosphoribosyl pyrophosphate; Qa, quinolinic acid; QaPRT, quinolinic acid phosphoribosyltransferase; R5P, ribose 5-phosphate.