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Source:
Science. Dec 6, 2013, Vol. 342 Issue 6163, p1243, 4 p.
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Science. Nov 16, 2012, Vol. 338 Issue 6109, p975, 6 p.
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Science. June 8, 2012, Vol. 336 Issue 6086, p1268, 6 p.
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Science. Jan 6, 2006, Vol. 311 Issue 5757, p83, 5 p.
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Science. Jan 14, 2005, Vol. 307 Issue 5707, p254, 5 p.
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Science. July 9, 2004, Vol. 305 Issue 5681, p248, 4 p.
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Science. April 23, 2004, Vol. 304 Issue 5670, p590, 4 p.
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Science. Sept 10, 1993, Vol. 261 Issue 5127, p1448, 4 p. table, graph
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