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ESI-FTMS analysis of QbsE. (a) His-tagged QbsE coexpressed with QbsC showing no modification to QbsE; (b) His-tagged QbsE coexpressed with QbsD showing removal of the carboxy-terminal Cys-Phe dipeptide; (c) His-tagged QbsE coexpressed with QbsD and QbsC showing replacement of the carboxy-terminal Cys-Phe dipeptide with sulfide.
