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MS2 fragmentation spectra of the cross-linked peptides identified in the ECM of dermal fibroblast cultures treated with TGFβ-1 for 30 days. Cross-links between LGPQGAPGdaQR and KGR (a) SdaQLQK and GKGR (b) QGoxPSGASGER and VTPKEK (c) NNQK and GKGR (d) and GVQGoxPPGPAGPR and KK (e) were found. Cross-linked glutamine (Q) and lysine (K) residues identified by MassMatrix are shown in red text. Hydroxyproline and deamidated glutamine residues are labelled as oxP and daQ, respectively.
