The TUPScan tool in the TUPDB is designed to check whether your peptides gained by phage display technology match any known TUP motif or sequence. If a peptide match a known TUP motif or sequence, this peptide is very likely to be a target-unrelated peptide rather than a true target binder. The tool will scan your peptides for all known TUP motifs, report possible TUPs in a table page.