Description_x000D_ Application_x000D_ 2′-Deoxyuridine (dU) is frequently halogenated to create thymidine analogues useful for studies of DNA synthesis and degradation mechanisms. Derivatized 2′-Deoxyuridines used as labeling substrates include chloro-2′-deoxyuridine (CldU), bromodeoxyuridine (BrdU) and/or iododeoxyuridine (IdU). Other useful analogues of 2′-deoxyuridine include 5-ethynyl-2′-deoxyuridine (DdU) and 5-hydroxymethyl-2′-deoxyuridine (HmdU)._x000D_ Packaging_x000D_ 1, 5 g in poly bottle_x000D_ 100, 250 mg in poly bottle