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A density modification technique for phase determination and refinement is described which replaces all density less than one-fifth of the average peak height by zero. Its effectiveness is demonstrated by applications to small proteins. With high resolution data, the method is successfully applied to phase refinement for Ribonuclease Apl. It has also been shown that for a small protein it is possible to obtain an ab initio solution of the structure by refining from a complete set of random phases for all reflexions.
日本結晶学会の論文