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MS/MS spectra of the precursor ions at m/z 637.36 (1A), 671.32 (1B), and 538.79 (1C) corresponding to doubly-charged peptides IIWTLTDINGK (1A), DFVIEANKSSTM (1B), and DSSVGEILTR (1C) from the digests of BoNT/B2. The spectra were obtained by LC-MS/MS on an FT-ICR mass spectrometer, with MS analysis in the FT-ICR cell and MS/MS analyses within the LTQ portion. Residues which are set in bold indicate amino acid substitutions
