Most such biomarkers can only be measured immunohistologically requiring biopsy and making repeat sampling difficult. Thymidine Kinase 1 (TK1) is up-regulated in cells synthesising DNA and many ...

THYMIDINE is a specific precursor of deoxyribonucleic acid 1. The very low energy of tritium electrons permits precise localization on autoradiographs (within less than one micron on average ...