TK Gene

**Semantic type:** Gene or Genome

**Definition:** The TK Gene encodes thymidine kinase, a transferase class pyrimidine salvage enzyme that catalyzes ATP-dependent phosphorylation of thymine deoxyribonucleoside. The TK gene and promoter are used widely in genetic research because of the easily selectable phenotype.

**Synonyms:** - Thymidine Kinase Gene