J. Appl. Cryst. (1978). 11, 268-272 [ doi:10.1107/S0021889878013308 ]
Abstract: A model building and refinement system is described for use with a Vector General 3400 display. The system allows the user to build models using guide atoms and angles to arrive at the final conformation. It has been used to assist in difference Fourier map interpretation at medium and high resolution, and to build a protein molecule into a multiple isomorphous replacement phased electron density map.
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