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).