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Source:
Science. 8/8/2008, Vol. 321 Issue 5890, p806-810. 5p. 6 Graphs.
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Source:
Science. 8/16/2002, Vol. 297 Issue 5584, p1119-1119. 1p. 2 Color Photographs, 1 Diagram.
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Source:
Science. 1/18/2013, Vol. 339 Issue 6117, p267-269. 3p.
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