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MS/MS of unique peptides NKFNLYVINEDIEKR from Orf-X1 (A); FTQIFSYILLNETSK from Orf-X2 (B); and TQSDNPEDPAIIVISSYK from Orf-X3 of BoNT/E3 (C). Y-ions are depicted in blue, b-ions are depicted in red, and the precursor ions are depicted in green.
