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W e have developed a new computer language that describes three-dimensional graphical objects in visual simulation. The language, 3D-Talk. is a powerful tool for visualizing the process of protein folding simulataon. 30-Talk is designed as an object-oriented language. with which users can create, manipulate, and edit graphical objects using commands with a syntax similar to that of a natural language.W e developed two novel molecular biology applications using 30-Talk. The first, ProView, is a protein visualization tool. ProView converts PDB(Protein Data Bank) data into 3D-Talk statements. The second is a visual simulation system for protein folding. It simulates the motion of protein folding using simulated annealing techniques and Hidden Markov Models.In short, 3D-Talk serves as a powerful animation tool.