NCIt definition : Human TK2 wild-type allele is located within 16q22-q23.1 and is approximately 40 kb
in length. This allele, which encodes thymidine kinase 2, mitochondrial protein, is
involved in the mitochondrial salvage pathway and plays a role in the phosphorylation
of thymidine, deoxycytidine, and deoxyuridine. Certain allelic variants of the TK2
gene are associated with myopathic mitochondrial DNA depletion syndrome.;