EBIProteins Get Proteomics Peptides

Get mass spectrometry proteomics peptide evidence for a protein from the EBI Proteins API. Returns detected peptides with their positions, uniqueness status, and source databases (PeptideAtlas, ProteomicsDB, MaxQB, EPD). Shows which parts of the protein have been experimentally confirmed by mass spectrometry. Useful for validating protein expression and mapping coverage. Example: P04637 (TP53) returns 64 detected peptides, P00533 (EGFR) returns 241 peptides.