SAPI is a CCP4-format program that applies a direct-methods procedure to ®nd heavy-atom sites using single-wavelength anomalous dispersion (SAD) or single-isomorphous replacement (SIR) data. The program is designed to run in a fast (typical CPU time consumed is less than 1 min) and simple way. User input is kept to a minimum and the default parameter values are adequate in most cases. It can also be used to solve general small-molecule structures.
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