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Source:
Science. Nov 22, 1996, Vol. 274 Issue 5291, p1377, 3 p. table, graph
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Science. Dec 5, 2003, Vol. 302 Issue 5651, p1772, 4 p.
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Science. July 18, 1997, Vol. 277 Issue 5324, p339, 7 p. table, chart
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Science. May 31, 1991, Vol. 252 Issue 5010, p1296, 5 p. photograph, chart, graph
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Science. Oct 22, 2004, Vol. 306 Issue 5696, p622, 3 p.
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