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The estrogenic activities of 17β-estradiol, biphenyl, chlorinated biphenyls, and Aroclor mixtures 1221, 1242, and 1248 were measured with a modified recombinant yeast estrogen assay (i.e., a Saccharomyces cerevisiae-based lac-Z (β-galactosidase) reporter assay). Modifications of the assay included the use of glass vials instead of plastic microtiter plates and the addition of the medium and yeast...
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