This document discusses several protein databases and bioinformatics tools. It describes Protein Data Bank (PDB) as a repository for 3D structural data of proteins and nucleic acids overseen by wwPDB. National Center for Biotechnology Information (NCBI) provides access to biomedical and genomic databases. BLAST is a tool that compares sequences to databases to find similar regions and calculate statistical significance of matches. Swiss-Prot, PIR, and UniProt are comprehensive protein sequence databases that include functional information derived from literature. ExPASy is a bioinformatics resource portal offering databases and tools in areas like proteomics, genomics, and systems biology.