Crosslinked peptide Matrix-assisted laser desorption ionization Post-Source Decay (MALDI-PSD-MS)
tryptic digest of BS3 cross-linked FGF-2. Cross-linked peptides are identified by using the program ASAP and are denoted with an asterisk (9). (B) MALDI-PSD spectrum of cross-linked peptide E45-R60 (M + H+ = m/z 2059.08).