Purines, pyrimidines, nucleosides, and nucleotides

aspartate carbamoyltransferase (RefSeq)

orotate phosphoribosyltransferase (OPRT) (OPRTase) (RefSeq)

cytidine deaminase (cytidine aminohydrolase) (RefSeq)

thymidine phosphorylase (RefSeq)

IMP dehydrogeanse (RefSeq)

GMP synthetase (glutamine aminotransferase) (RefSeq)

Hypoxanthine phosphoribosyl transferase (RefSeq)

thymidylate synthetase (RefSeq)

putative deoxyguanosine triphosphate triphosphohydrolase (RefSeq)

bifunctional IMP cyclohydrolase (N-terminal); phosphoribosylaminoimidazolecarboxamide formyltransferase (C-terminal) (RefSeq)