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    Academic Journal

    Source: Proceedings of the National Academy of Sciences of the United States of America. 5/21/2013, Vol. 110 Issue 21, p8513-8518. 6p.

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    Academic Journal

    Source: Proceedings of the National Academy of Sciences of the United States of America; 5/4/2010, Vol. 107 Issue 18, p8135-8140, 6p, 1 Diagram, 1 Chart, 1 Graph

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    Academic Journal

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    Academic Journal

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