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I got a FASTA file from NCBI RefSeq. These proteins are annotated with IDs like this : protein_id=XP_019970915.1. What type of ID is this? I would like to have them converted in TrEMBL IDs in order to do, later, a GO term enrichment but I have to know where I am starting from. Thank you in advance

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I'm not sure I understand the question, but XP_019970915.1 is an 'NCBI Reference Sequence' ID for 'erythrocyte binding antigen-181' (https://www.ncbi.nlm.nih.gov/protein/XP_019970915.1/). If you look that protein up in UniProt you can find other identifiers/info and GO annotations etc (https://www.uniprot.org/uniprot/A0A151LVZ9). Does that answer your question?

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    $\begingroup$ In full thanks! $\endgroup$ – Firingam Nov 17 '20 at 7:47

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