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Group a: 106 cells treated with 0.25 µg MNPs with MNP/DNA mass ratio of 1∶1, 1∶2, 1∶4 respectively. Group b: 106 cells cells treated with 0.5 µg MNPs with MNP/DNA mass ratio of 1∶1, 1∶2, and 1∶4 respectively. Group c: 106 cells treated with 1 µg MNPs with MNP/DNA mass ratio of 1∶1, 1∶2, and 1∶4 respectively.
