Figure 3From: Identification of ubiquitin/ubiquitin-like protein modification from tandem mass spectra with various PTMsThe process of mass shift path finding. (a) Equivalent mass differences are clustered as mass shift classes and evaluated. (b) Qualified mass shift classes are connected into mass shift sets and evaluated to find the mass shift paths. Fragmented Ubl produces various mass shifts while most of non-peptide PTMs produce only one mass shift.Back to article page