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PDB (Protein Data Bank) is an international database that stores protein structure data. It provides global protein structure information, including atomic coordinates, structural topology, and other related experimental and computational results. The PDB database is jointly managed and maintained by multiple international cooperation organizations.

The main goal of the PDB database is to provide detailed information on protein structures for scientific researchers, biologists, and drug designers. Proteins are crucial molecules in living organisms, and understanding their three-dimensional structure is crucial for understanding their functions and interactions. Through PDB, researchers can access tens of thousands of protein structures and conduct various analyses and comparative studies.

Each entry in the PDB database represents a protein structure, which includes detailed descriptions of the protein's sequence information, topological structure, and chemical composition. These data are obtained through experimental techniques such as X-ray crystallography, nuclear magnetic resonance, etc., or computational simulation methods such as molecular dynamics simulations. The PDB database also provides a series of tools and resources to assist researchers in structural visualization, functional prediction, and drug design.