DNAs were combined (10 μM each) with DB2277 in 150 mM NH4OAc buffer. Samples were scanned from m/z 500–3000 in negative ion mode at a rate of 5 μl·min−1 on a Waters Micromass ESI-Q-ToF spectrometer and analyzed with MassLynx 4.1 software. See Supplementary Data for more details.
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