The detection of cell proliferation is of utmost importance for monitoring of cell vitality, determining genotoxicity or evaluating anticancer drugs. The feeding of cells with baseclick EdU (5-ethynyl-2’-deoxyuridine), EU (5-ethynyl-2’-uridine) can be used in cell proliferation studies and provide a superior alternative to bromodeoxyuridine (BrdU) or the radioactive tritium assays. The advantage of this technology lays in the fact that they are not antibody based and therefore do not require DNA denaturation for detection of the incorporated nucleoside. Instead, click chemistry with a variety of fluorescent tags is used for detection. Furthermore, the streamlined detection protocol both reduces the total number of steps and significantly decreases the total amount of time. Beside our ready-to-use EdU cell proliferation kits, we also offer you the free nucleosides 5`Ethynyl-dU as well as 5-Ethynyl-U.