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. Author manuscript; available in PMC: 2019 Apr 15.
Published in final edited form as: J Proteome Res. 2018 Sep 28;17(12):4337–4344. doi: 10.1021/acs.jproteome.8b00544

Figure 4.

Figure 4.

PSM for SEYTYGASYR in PeptideAtlas. With an iProphet probability of 1.000, all y ions y1 – y10 are observed, as well as b1 – b8, with many neutral loss ions, internal fragmentation ions, and other corroborating peaks. With a simple mapping search, this peptide appears to be uniquely mapping to a protein not seen anywhere else in PeptideAtlas, a one-hit wonder. With the complex fuzzy mapping capabilities of ProMaST, a potential alternative mapping to a highly variable region of an immunoglobulin is revealed.