Note to PIR-NREF users:For sequence searching, UniRef100 provides clustered sets of 100% identical sequences and subsequences from the UniProt Knowledgebase (including splice variants and isoforms) and from selected UniParc records (mainly from PDB, Refseq and Ensembl databases). It combines identical sequences and sub-fragments with 11 or more residues (from any organism) into a single UniRef entry, displaying the sequence of a representative protein, the accession numbers of all the included UniProtKB entries, and links to the corresponding UniProtKB and UniParc records.
PIR-NREF has been discontinued inasmuch as the UniProt databases now include all of its functionalities (Final Release 1.83, 16-Jan-2006). This consolidation provides one centralized comprehensive database and minimizes duplication of work between UniProt and PIR.
For text searching, iProClass now consists of the UniProtKB entries plus selected unique UniParc sequences containing name and taxonomy information.
Link to iProClass based on NREF ID:
To map an NREF ID to a UniProt identifier and/or to an iProClass report, please use the following format: