An X-ray crystal structure of an organic anion transporter identifies it as an ion channel instead. Its similarity to an unrelated family of water channels raises evolutionary questions that have been recently bubbling up around membrane proteins.
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Theobald, D., Miller, C. Membrane transport proteins: surprises in structural sameness. Nat Struct Mol Biol 17, 2–3 (2010). https://doi.org/10.1038/nsmb0110-2
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DOI: https://doi.org/10.1038/nsmb0110-2
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