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. 2013 Sep 12;8(9):e73906. doi: 10.1371/journal.pone.0073906

Figure 5. Representative annotated MS3 spectrum of the Pept+HexNAc product ion (m/z 1411, z=2).

Figure 5

The Pept+HexNAc product ion derives from the MS2 fragmentation of the MH3+ ion (m/z 1210) of Pept127-145 glycoform B. The corresponding MS3 spectra for the other glycoforms were identical. The fragment ions with a square symbol are those with the HexNAc residue still in place, while those with a star have undergone the neutral loss of the HexNAc residue. HexNAc was annotated here at N131 based on evidence not related to this MS3 spectrum (see main text). Annotated fragments are within 0.6 Da from the theoretical value.