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Please be aware that usually only one of the possible peptide to protein mappings are kept in PRIDE. In shotgun proteomics experiments, protein inference needs to be taken into account when interpreting protein identifications reported that are based on non-ambiguous (or shared) peptides.

Please refer to the reference below if you want a detailed explanation on the problem:

Nesvizhskii AI, Aebersold R. Interpretation of shotgun proteomic data: the protein inference problem. Mol Cell Proteomics. 2005 Oct;4(10):1419-40. Epub 2005 Jul 11. PubMed PMID: 16009968.

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