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Stage-related induction of chromosomal aberrations and SCE in mouse embryos treated transplacentally during
1Institute for Drugs, Federal Health Office, Berlin, FRG.
Abstract:
During organogenesis, mouse embryos were treated transplacentally with MMC and DMBA. The clastogenic and SCE-inducing effects of MMC and the clastogenic effects of DMBA were analyzed in metaphases from whole embryo suspensions. Positive effects were observed on all the days of pregnancy on which the embryos were analyzed, i.e., on days 10, 11, 12, and 13. Whereas the MMC-induced SCE-frequencies did not change significantly during the tested period, the clastogenic effects of MMC and DMBA varied drastically. Extremely high aberration rates were observed in embryos on day 11; on the other days the aberration rates were much lower. Factors that might have given rise to these stage-related effects are discussed.
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