Given that many protein structures have the same function, for example, why do proteins use only some and not others?

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Foldit, an online video game, allows nontechnical, nonbiologist players to visually "fold" protein structures, while computers calculate the chemical interactions corresponding to each arrangement.

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At the moment, laboratories are competing to work out the same protein structures, rather than collaborating in the way that they did to produce the human genome.

ECONOMIST: Structural genomics