Purines, pyrimidines, nucleosides, and nucleotides

dihydroorotase (RefSeq)

carbamoyl phosphate synthase small subunit (RefSeq)

carbamoyl phosphate synthase large subunit (RefSeq)

orotidine 5'-phosphate decarboxylase (RefSeq)

guanylate kinase (RefSeq)

dihydroorotate dehydrogenase 2 (RefSeq)

cytidylate kinase (RefSeq)

CTP synthetase (RefSeq)

ribose-phosphate pyrophosphokinase (RefSeq)

bifunctional phosphoribosylaminoimidazolecarboxamide formyltransferase/IMP cyclohydrolase (RefSeq)