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Characterization of the cross-linker, SAMS, by MALDI-TOF MS and a synthetic peptide. (a) Starting CGQR peptide average MH+ 1556.76 (sequence CGQRSLQHPHKHAG); (b) SAMS modified peptide, MH+ 1730.94; (c) SAMS modified CGQR peptide undergoing deacetylation, MH+ 1688.90. (d) Selective retrieval of the deacetylated modified peptide, 1746.98 m/z.
