pepgrep offers a quick and friendly way to examine MS tandem output data by finding a spectral pattern matching selected peptide sequence. It is database-free command-line utility that uses Peptide-to-MS2 scoring algorithm. The Peptide-to-MS2 pattern matching can accumulate dozens of mass offsets corresponding to a variety of Post-Translational Modifications. Decoy peptide sequences are used with the tested peptide sequence to reduce false-positive results. Read article at: http://www.sciencedirect.com/science/article/pii/S1672022913000302
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