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Plasma was processed at 0, 8, 24 and 72 hours, and stored at room temperature (RT) or 4°C (4C). (A) Total DNA copy number per ml of plasma, (B) long DNA copy number per ml of plasma; n = 10. (C) Male DNA copy number per ml of plasma, and (D) percentage of fetal DNA; n = 6. *indicates statistical significance.
