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A stable homotetrameric complex predicted by PISA for PDB entry 1g9u (Y. pestis cytotoxin YopM). Green and black spheres represent Ca2+ and Hg2+ ions, respectively. The tetramer represents a superhelix featuring a hollow cylinder with an inner diameter of ∼35 Å. The same structure was obtained in a different crystal form: PDB entry 1jl5. See discussion in the text. The image was produced using the CCP4mg graphical viewer (Potterton et al., 2004 ▶).
