- 2.4.2.11 nicotinate phosphoribosyltransferase
- 2.4.2.19 nicotinate-nucleotide diphosphorylase (carboxylating)
- 2.4.2.21 nicotinate-nucleotide-dimethylbenzimidazole phosphoribosyltransferase
- 2.7.7.18 nicotinate-nucleotide adenylyltransferase
- 3.5.1.42 nicotinamide-nucleotide amidase
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