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Electrophoretic patterns of DNA isolated from NaBu-treated and untreated CHO cells. Isolated chromosomal DNA (2 μg) was electrophoresed on 5% polyacrylamide gel and intact and fragmented DNA bands were revealed by silver staining. Arrowheads designate DNA ladder formation. M: molecular weight marker, 100-bp DNA ladder. DNAs were isolated from day 8 cultures exposed to different concentrations of Nabu.
