MassQC Help > Metrics > Identifications          
The Metrics that Describe the Identifications:
  • Peptide Count is the number of unique peptides.
  • Percent Semi-tryptic are peptides which were cleaved at the C-Terminal side of arginine (R) and lysine (K) by trypsin at one end but not the other. The figure below shows some semi-tryptic peptides.
  • Search Score is the score assigned by the software (the search engine) that associates the spectra with the peptides.
  • Mass Accuracy is the difference between the mass observed with the mass spectrometer and the known mass of the peptide precursor molecule.

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