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. 2015 Apr 14;5(2):378–411. doi: 10.3390/biom5020378

Figure 3.

Figure 3

Incorrectly assigned oxidation to proline using a probability-based search engine. (a) Search engine identified 2 modifications on one peptide: methionine-7 mono-oxidation and proline-9 oxidation; (b) de novo sequencing showed that methionine is dioxidised.