PhosCalc is a system for estimating the site of phosphorylation in a phosphorylated peptide with ambiguous sites. It does this by generating ions from peptide sequences and calculating their masses, generating different ions and masses for water-loss, different cysteine modifications and different charge states.
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BMC Res Notes. 2008 Jun 23;1:30. doi: 10.1186/1756-0500-1-30.
PhosCalc: a tool for evaluating the sites of peptide phosphorylation from mass spectrometer data.
MacLean D, Burrell MA, Studholme DJ, Jones AM.