[Human thymidylate synthetase protein (312 aa, 36 kDa) is encoded by the human (TYMS) gene. The protein is a conserved transferase enzyme that catalyzes methylene tetrahydrofolate (MTHF)/dUMP conversion to dihydrofolate/dTMP in thymidine triphosphate/deoxyribonucleotide biosynthesis. Thymidylate synthetase competes with the methylene tetrahydrofolate receptor for MTHF and maintains the dTMP pool for DNA replication and repair. ( NCI )]