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Nature 441, xi (1 June 2006) | doi:10.1038/7093xia; Published online 31 May 2006

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Making the paper: Donna G. Blackmond

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What made amino acids into lefties?

Many molecules are 'chiral', meaning they exist in two forms that are mirror images of each other — like left and right hands. But biology prefers playing with a single form.

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