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In dealing with anomalous diffraction data from proteins,the probability distribution of three-phase structure invariants provides additional information,which can be used to resolve the phase ambiguity intrinsic in single-wavelength anomalous diffraction (SAD) enabling solution of the protein structure.Based on this,direct methods have also been used in phasing multi-wavelength anomalous diffraction (MAD) data leading to better result than that from the conventional MAD phasing.