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
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
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.
Include mappings to the following databases (if available):