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A brief description of the Molecular Modeling System-X graphics system hardware is followed by an explanation of the language which has been developed to realize an `electronic Richards box'. A variety of commands permits the construction and manipulation of a protein model within an electron density distribution. Usually about ten amino-acid residues can be displayed at any one time within a box of 20 grid points on an edge. The density is changed automatically as the viewer translates the model off the edge of the screen. He can then add, subtract or modify residues as appropriate.

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