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–ESI fragment ion spectra of the m/z 148 fragment recorded with collision energy set at 20 eV for (A) the base released from 5′-CCAGGAUCGm1AAACCUGG-3′ with 85 V cone voltage, (B) the m1A base anion released from 1-methyladenosine with 50 V cone voltage and (C) the m6A base anion released from 6-methyladenosine with 50 V cone voltage.
