Ball-and-stick model of a potassium channel from the bacterium Streptomyces lividans looking down the pore, which has a potassium ion (red sphere) positioned inside it. The protein is composed of four identical subunits surrounding a central pore. The overall molecular architecture is expected to be preserved in all known potassium channels. See page 69, the Research commentary on page 56, and the related Report on page 106. [Image: R. MacKinnon]

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