The 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.
Kang and Yi BMC Bioinformatics 2011 12(Suppl 14):S8 doi:10.1186/1471-2105-12-S14-S8