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how to map peptide to Protein?

Hi, I downloaded the Proteome profiling of the TCGA samples. the structure of each record is as below:

AGID            lab_id  catalog_number  set_id  peptide_target        TCGA-BH-A1FN-11A
AGID00100     882     sc-628      Old      1433BETA              0.67451

That is a sample record for TCGA-BH-A1FN-11A. Now, I need to know which computational way can map the 'peptide_target' to the protein? because I would like to find a gene symbol that codes to my target protein(map to peptide).

I appreciate it if anybody shares his/her comment with me.

Best Regards

protein proteomics peptide tcga

Really thank you for your comment.

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