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The frequencies of CAs in human lymphocytes treated with different concentrations of MMC and XEEs. (Values are expressed as mean ± SD for four cultures in each group. The bars are shown by different letter are significantly different from each other at a level of 5 %. MMC: 10−7 M mytomicin; XEE1: 25 µg/ml X. elegans water extract; XEE2: 50 µg/ml X. elegans water extract; XEE3: 100 µg/ml X. elegans water extract)
