in experiments to assess the effects of several biological , chemical , and physical variables on sister-chromatid exchange ( sce ) induction in cultured lymphocytes exposed to mitomycin c ( mmc ) before pha stimulation we observed : ( 1 ) high sce frequencies in female cells , and normal sce frequencies in y-bearing metaphases in mixed cultures containing equal numbers of mmc-treated female lymphocytes and untreated male lymphocytes ;
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cells
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sce