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. 2011 May;137(5):427–433. doi: 10.1085/jgp.201010533

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© 2011 Dixit and Asthagiri

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Figure 1. — (Left) K⁺ ion (magenta sphere) is shown bound in the S₂ site of the selectivity filter (green ribbon). The backbone carbonyl groups of the S₂ site are shown as spheres. (Right) View looking down the pore axis. Atoms are shown in space-filling format.