Figure 3.

Mass spectra of the Endopep-MS BoNT/B1 reaction with mAb 6A12 (3A), no antibody (3B), or mAb 2B27 (3C). The peptide cleavage product indicating that BoNT/B1 is present to some extent in all cases is at m/z 1759.9 and the internal standard is present at m/z 1766.9.