tritiated thymidine

trit·i·at·ed thy·mi·dine

thymidine containing the hydrogen α-emitting radionuclide, tritium (3H or hydrogen-3); used as a marker to measure and localize by radioautography the synthesis of DNA, into which it is incorporated.

tritiated thymidine

(trĭt′ē-āt″ĭd thī′mĭ-dēn″, trĭsh′) 3H-Tdr; a radioactively labeled nucleoside used to measure T lymphocyte proliferation in vitro. Thymidine is essential for DNA synthesis; thus the amount of 3H-Tdr taken up is a general measure of the number of new lymphocytes produced.