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. Author manuscript; available in PMC: 2010 Mar 1.
Published in final edited form as: J Proteome Res. 2009 Mar;8(3):1415–1422. doi: 10.1021/pr800774h

Figure 3.

Figure 3

Fraction of theoretical fragments ions that are matched to a peak in the recorded spectra for b- and y- type ions intensity for high confidence spectra recorded on either an LTQ ion trap or QSTAR Pulsar i Q-TOF. For the LTQ, high confidence assignments are associated with a high proportion of matched ions of both b- and y-types with only subtle bias seen with Lys-N compared to trypsin. Analysis using a QSTAR is associated with a much stronger bias toward one ion type depending on the enzyme used.