Protein Identifier Cross-Reference


Shutdown Warning:

This service will be shutting down by the end of 2018. It will be replaced by the UniParc programatic service. If you have any questions about the service, please contact the EBI Proteins API group. The UniProt website offers ID mapping, Peptide Search and BLAST services. If they don't meet your requirements and you require a web interface beyond 2018, please contact the UniProt helpdesk.

Input Data


Enter one or more valid protein accessions (one per line) and click on on submit. Alternatively, enter one or more protein sequences in FASTA format and select "Protein Sequence" as input type. You may also upload a file that contains either protein identifiers (one per line) or protein sequences in FASTA format. The file must be less than 2MB in size.

Click here to load example data to try out PICR: Load example data

Output Parameters

View results as:

Project description

Each major protein database uses its own conventions when assigning protein identifiers. Resolving the various, potentially unstable, identifiers that refer to identical proteins is a major challenge.

The Protein Identifier Cross-Reference (PICR) service is a web application that provides interactive and programmatic (SOAP and REST) access to a mapping algorithm based on 100% sequence identity to proteins from over 98 distinct source databases. Mappings can be limited by source database, taxonomic ID and activity status in the source database. Users can copy/paste or upload files containing protein identifiers or sequences in FASTA format to obtain mappings using the interactive interface. Search results can be viewed in simple or detailed HTML tables or downloaded as comma-separated values (CSV) or Microsoft Excel (XLS) files suitable for use in a local database or a spreadsheet. Alternatively, a SOAP interface is available to integrate PICR functionality in other applications, as is a lightweight REST interface.

Input Parameters



Mapping Databases

Include mappings to the following databases (if available):

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Documentation:

Downloads:


Mailing lists, bug reports

Acknowledgements:

iSPIDER
BBSRC