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The alkaline elution method was adapted to the evaluation of DNA damage induced in vivo through a practical and reliable microfluorometric procedure, without any need for tissue pre-labeling. The DNA damage induced in vivo by treatment with a single dose of N-nitrosodimethylamine (DMNA), N-methyl-N-nitroso-urea (MNU), 1,2-dimethylhydrazine (DMH) or cycasin has been detected in different organs of mice or rats. The results obtained are rather consistent with the organotropism of these carcinogens, and show a satisfactory dose dependent of DNA damage. DMH and cycasin, both negative in the Ames' Salmonella/microsome mutagenicity test, are clearly positive with in vivo DNA damage/alkaline elution assay. This latter method, complemented with other short-term tests, may play a useful role in the pre-screening of chemical carcinogens.
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