PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 20544521-3 2010 Apart from the complex de novo synthesis of dTTP through UDP reduction, dTTP is provided through salvage of thymidine catalyzed by the thymidine kinases, the cytosolic and cell cycle regulated TK1 and the mitochondrial and constitutively expressed TK2. thymidine 5'-triphosphate 72-76 thymidine kinase 2 Homo sapiens 248-251