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In vitro assays of LahM1 and LahM2 with LahA5. MALDI-TOF MS spectra of (A) His-LahA5 incubated with heat-inactivated enzyme; (B) His-LahA5 incubated with MBP-LahM1; (C) His-LahA5 incubated with MBP-LahM2; and, (D) His-LahA5 incubated with MBP-LahM1 and MBP-LahM2. (E) Tandem ESI-MS fragmentation of LahM1- and GluC-modified LahA5 core peptide. Masses of the ions shown are listed in Table S3.
