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Comparison of parental MDA-MB-231 cells with radio- and chemoresistant MDA-MB-231/IR cells. (A) Representative images of the clonogenic assay and (B) the surviving fraction of MDA-MB-231 and MDA-MB-231/IR cells after five days of irradiation. MTT assay of MDA-MB-231 and MDA-MB-231/IR cells after (C) Adriamycin and (D) cisplatin treatment for 24 h. Asterisks (*) indicate significant differences at p < 0.05.
