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Proceedings of the National Academy of Sciences, Vol. 106, No. 8. (24 February 2009), pp. 2595-2600.
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Proceedings of the National Academy of Sciences of the United States of America (5 February 2009)
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Proceedings of the National Academy of Sciences, Vol. 106, No. 5. (3 February 2009), pp. 1299-1300.
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Proceedings of the National Academy of Sciences, Vol. 106, No. 5. (3 February 2009), pp. 1415-1420.
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