A new method for identifying the replicated DNA at the electron microscope level is described. Cells were first exposed in vitro to 5-bromodeoxyuridine (BUdR) in conjunction with 5-fluorodeoxyuridine (FUdR) and BUdR incorporated into DNA was then detected on Lowicryl-embedded sections by immunogold technique using a monoclonal anti-BUdR antibody. After using this method, chromatin and chromosomes are strongly labelled.
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Thiry et al. (1988) studied this question.
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