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MALDI-TOF mass spectra. (A) Targeted cleavage of Fl-RRE RNA by Fe-EDTA-Rev, (B) non-targeted cleavage of Fl-RRE RNA by Fe-EDTA lacking Rev, or (C) lack of cleavage in the absence of catalyst, each after a 1 h incubation in the presence of 1 mM ascorbate/H2O2. Mass-matching was performed with a matching tolerance of 200 ppm (0.02 % of the m/z). For predicted masses, see Table SM3 of the Supporting info. Only a small fraction of the product assignments are shown here.
