NAD+ Biosynthesis

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Alternative pathway and NADP+ biosynthesis
Formation from tryptophan catabolism
cyclic-ADP-ribose biosynthesis
5-phospho-α-D-ribose 1-diphosphate biosynthesis
EC nicotinate-nucleotide diphosphorylase (carboxylating)
EC nicotinate-nucleotide adenylyltransferase
EC nicotinate phosphoribosyltransferase
EC NAD+ synthase (glutamine-hydrolysing)