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Nature 450, 621-622 (29 November 2007) | doi:10.1038/450621a; Published online 28 November 2007

Cell biology: Pore puzzle

John D. Aitchison1 & Richard W. Wozniak2

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Where would you start in trying to work out the structure of a macromolecular machine consisting of 456 proteins? Taking a combined experimental and computational approach is one answer.

Consider a 1,000-piece jigsaw puzzle. There are millions of ways in which the pieces might fit together, yet there is only one solution.

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