Biosynthesis of cofactors, prosthetic groups, and carriers:Pyridine nucleotides

Quinolinate synthetase A (NCBI)

NAD+ synthase related protein (NCBI)

Quinolinate phosphoribosyl transferase:Nicotinate-nucleotide pyrophosphorylase (NCBI)

Cytidylyltransferase:Cytidyltransferase-related domain (NCBI)