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Negative-ion mode ESI FT-ICR CID MS2 of the precursor ions at m/z 1490 from the WT (A), at m/z 1506 from the WT (B), at m/z 1889 from the WT (C), and at m/z 1740 from the pagL mutant (D). The insets display the proposed structures for each ion, with dashed lines across likely bond cleavage sites. The nomenclature associated with each m/z value indicates neutral loss or cross-ring designation as described in the text.
