Figure 4.

The enlarged version of the tandem MS spectra of the 1418.573 peak. The putative peptide species are those which received the best SearchXlinks score for a given m/z ratio, and which had a score above 20. The structure of the putative peptide species and the score received is indicated. The "|" sign joins crosslinked lysines. Fragment ions recognized by SearchXlinks during the scoring process were labelled red. Tandem MS precursor ion peak were labelled green, and the remaining identified peaks were labelled blue.