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May I inquire if someone has a copy of Zhu et. al. (Acta Cryst. D. 2008 D64, 843-850) that might be posted somewhere free? I don't have subscription to Acta Cryst D and this one is possibly a problem I have in a structure and I don't understand what it means exactly. Or if someone can give a definition in terms that is simple (for my simple mind). Thanks -- Laurie Betts X-ray Crystallography Facility Manager Department of Structural Biology University of Pittsburgh 1050 BST3 3501 Fifth Ave Pittsburgh, PA 15260 412-383-5839