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(A,B). Mitochondrial DNA copy number in MCF7 (A) and FaDu (B) cells measured by real-time quantitative PCR. The cells were exposed to HAL, PLEC and MRC and, after 24 h of incubation, DNA was extracted. Values are expressed as the means ± SD. ** p < 0.01, *** p < 0.001 vs. control group.
