COVER Crystallographic structure of AmtB, a bacterial channel that transports the gas ammonia. During transport, ammonium ions (NH₄⁺, the green sphere) are recruited and -cation stabilized; then only uncharged ammonia (NH₃) enters the hydrophobic channel itself (three purple spheres). This mechanism prevents leakage of other ions or transmembrane potential. See page 1587. [Image: S. Khademi]

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