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This little structure would now be handles quite differently, by heavy-atom methods, using one crystalline form alone.
Vainshtein BK, Feigin LA, Lvov YM, Gvozdev RI, Marakushev SA, et al. (1980) Determination of the distance between heavy-atom markers in haemoglobin and histidine decarboxylase in solution by small-angle X-ray scattering.