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Source:
Science. May 16, 2003, Vol. 300 Issue 5622, p1063, 2 p.
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Science. Nov 8, 2002, Vol. 298 Issue 5596, p1151, 2 p.
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Source:
Science. March 9, 2001, Vol. 291 Issue 5510, 1881.
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Source:
Science. March 13, 1992, Vol. 255 Issue 5050, p1348, 2 p. graph
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