03 April 1998
Vol 280, Issue 5360

About The Cover

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 69, the Research commentary on 56, and the related Report on 106. [Image: R. MacKinnon]