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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.

STEP (Standard for the Exchange of Product model data) is an international standard used for data exchange in the fields of computer-aided design (CAD) and computer-aided manufacturing (CAM). It defines a universal data format for describing and exchanging product model data.

STEP files adopt a neutral, platform independent representation method that allows for data exchange across different CAD software and systems. It uses an entity based data model, as well as a unified data structure and semantic rules, to ensure data consistency and reliability.

STEP files can contain rich product model information, such as geometric shape, topological relationships, material properties, assembly structure, dimensions and tolerances, and process information. It supports multiple geometric types of representations, including points, lines, curves, surfaces, volumes, etc., while also storing other non geometric attributes such as color, mass, material properties, etc.

There are many advantages to using STEP format for data exchange. Firstly, it allows seamless data interoperability between different CAD software, thereby avoiding issues of data conversion and information loss. Secondly, STEP files are text based, have good readability, and are easy to view and edit. In addition, as STEP is an international standard, it can promote global data exchange and cooperation.

In the fields of industrial manufacturing and engineering, STEP is widely used in product design, process planning, CNC machining, assembly analysis, virtual prototyping, and other links. It provides a standardized data exchange method, promotes the integration and collaborative work of design and manufacturing processes, and improves production efficiency and quality.