Mass spectrometric analysis of adseverin. (A) Peptide mass fingerprint data for adseverin. The observed peptide MH⁺ ions characteristic of adseverin are labeled on the spectrum based on a theoretical digest of adseverin allowing for one missed trypsin cleavage and no fixed or variable modifications. (B) Spectrum of product ions derived from a precursor of mass/charge (m/z) 1367.7 Da during tandem mass spectrometric analysis. The b and y ion series were assigned using BioTools software (Bruker, Bremen, Germany).