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CID cleavage of CBDPS cross-links. A, CID cleavage of CBDPS dead-end cross-links. B, cleavage of interpeptide CBDPS cross-links. P1 and P2 are the cross-linked peptides. C, CID cleavage of dead-end CBDPS cross-links from the test peptide. The characteristic ions for the isotopically coded fragments from the dead-end cross-links are marked by asterisks. D, CID cleavage of the CBDPS interpeptide cross-link from the test peptide.
