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Identification of cross-link peptide in mutant complex. The complex formed between mutant scaffolding protein D58K and wild type connector was cross-linked. A unique band in the SDS-PAGE was in-gel digested and yielded a unique parent ion of m/z = 876.7647 (6+ charge) that was subjected to MS/MS. The series of b- and y-ions generated by fragmentation and their assignments are indicated and mapped onto the sequence of the cross-linked peptide.
