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Removal of interference using DMS. The signal from blank matrix CT (calf-thymus) DNA was removed in DMS-on mode to produce a linear calibration curve using ethyl acetate as the modifier: signals from (A) blank calf thymus DNA in the DMS-transparent mode, (B) blank calf thymus DNA in DMS-on mode, (C) 5.8 femtomoles of the analyte in 2 μg calf thymus DNA in DMS-on mode.
