omics</a> website which in turn derived the rules are from <a href="https://web.expasy.org/peptide_cutter/peptidecutter_enzymes.html">expasy</a>. Some entries (Lys-C/ Lys-N) were updated according to <a href="https://github.com/OpenMS/OpenMS/blob/develop/share/OpenMS/CHEMISTRY/Enzymes.xml">OpenMS</a>. A useful resource for testing Regex can be found <a href="https://regex101.com/">here</a>.</p>
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