Protein Sequence Database (PSD) (http://pir.georgetown.edu/pirwww/search/textpsd.shtml) of functionally annotated protein sequences, which grew out of the Atlas of Protein Sequence and Structure (1965-1978) edited by Margaret Dayhoff and has been incorporated into an integrated knowledge base system of value-added databases and analytical tools.

iProClass, (http://pir.georgetown.edu/iproclass)   a central point for exploration of protein information, provides summary descriptions of protein family, function and structure for PIR-PSD, Swiss-Prot, and TrEMBL sequences, with links to over 50 biological databases
PIR-NREF, (http://pir.georgetown.edu/pirwww/search/pirnref.shtml)   a comprehensive database for sequence searching and protein identification, contains non-redundant protein sequences from PIR-PSD, Swiss-Prot, TrEMBL, RefSeq, GenPept, and PDB.
PIR
PIR-International Protein Sequence Database