Abstract
The effect of novobiocin on the frequencies of chromatid-type aberrations and SCEs was examined in Chinese hamster V79 cells which were exposed to γ-rays and post-treated with novobiocin. While no chromatid aberrations were induced in the unirradiated cells by novobiocin, the frequency of SCEs was slightly increased by treatment with novobiocin alone. Irradiation of G2 cells produced multiple chromatid-type aberrations and post-treatment of the irradiated cells with novobiocin resulted in a significant increase of the aberrations, including chromatid gaps and breaks. In contrast, novobiocin failed to increase the frequency of SCEs induced by γ-rays when the irradiated cells were post-treated with novobiocin.
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