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Analysis of DNA fragments of HeLa cells treated with EOT. M: DNA marker, lane 1: normal control, lane 2: 500 mg/L for 24 h, lane 3: 100 mg/L for 24 h, lane 4: 50 mg/L for 48 h, lane 5: 50 mg/L for 24 h, lane 6: 100 mg/L for 48 h, lane 7: 500 mg/L for 48 h.
