Spectra & PSM

Annotate tandem mass spectra and identify MGF spectra against a record, FASTA proteins or every protein of the archive.

• Fragment ions matched within a tolerance in Da or ppm
• X!Tandem hyperscore and E-values
• Target–decoy FDR with q-values
• Protein inference by UniProt accession

On synthetic spectra of modified peptides among 2,000 random proteins, at least 120 of 150 identified correctly at 1% FDR, at most 3 wrong.

Proteomics · free, no account; also through the API and the MCP server.