PIR: Protein Information ResourceProvides a wide variety of resources mainly oriented to assist the propagation and standarization of protein annotation. PIR has many protein databases and analysis tools freely accessible to the scientific community, including the Protein Sequence Database (PSD), the first international database. It also has UniProt, a single worldwide database of protein sequence and function created by unifying the PIR-PSD, Swiss-Prot, and TrEMBL databases.