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Figure 4 (a) Side view and (b) top view of potassium channel from Streptomyces lividans (PDB code 1bl8 ). The potassium ions and a water molecule are shown as spheres. (c) Distances and angles between the centres of mass of the four subunits. (d) Schematic representation of the molecule, exhibiting fourfold symmetry.

© International Union of Crystallography 2009