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. Author manuscript; available in PMC: 2013 Aug 1.
Published in final edited form as: Expert Rev Proteomics. 2012 Oct;9(5):533–548. doi: 10.1586/epr.12.41

Figure 3. Comparison between the (A) CID and (B) ETD spectra of a +3, quadruply phosphorylated peptide from testis-specific serine/proline-rich protein.

Figure 3

While the CID spectrum is dominated by the neutral loss of phosphoric acid from the intact precursor, the ETD spectrum shows significant, sequence-informative peptide backbone fragmentation. Calculated m/z values found in the spectra are shown in bold while those m/z values exhibiting the neutral loss of phosphoric acid are underlined. Δ denotes assigned sequence ions which have undergone the neutral loss of phosphoric acid.

CID: Collisionally induced dissociation; ETD: Electron transfer dissociation.