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Source:
Science. Feb 27, 2004, Vol. 303 Issue 5662, p1364, 4 p.
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Science. June 17, 2005, Vol. 308 Issue 5729, p1786, 4 p.
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Science. Feb 27, 2004, Vol. 303 Issue 5662, p1361, 4 p.
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Science. Oct 24, 2003, Vol. 302 Issue 5645, p630, 4 p.
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Science. Jan 17, 2003, Vol. 299 Issue 5605, p396, 4 p.
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Science. Jan 24, 1997, Vol. 275 Issue 5299, p527, 4 p. photograph, table, graph
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Science. June 17, 2005, Vol. 308 Issue 5729, p1789, 3 p.
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Science. April 9, 2004, Vol. 304 Issue 5668, p234, 3 p.
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Science. Oct 24, 2003, Vol. 302 Issue 5645, p575, 3 p.
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Science. April 5, 2002, Vol. 296 Issue 5565, p60, 3 p.
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