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Source:
Science. Feb 11, 2005, Vol. 307 Issue 5711, p875, 5 p.
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Science. Jan 31, 2003, Vol. 299 Issue 5607, p679, 4 p.
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Science. Dec 5, 1997, Vol. 278 Issue 5344, p1784, 5 p. chart, graph
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Science. Oct 25, 1996, Vol. 274 Issue 5287, p589, 4 p. graph
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