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Source:
Science. 9/10/1999, Vol. 285 Issue 5434, p1674-1676. 3p. 1 Chart.
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Source:
Science. 9/8/2006, Vol. 313 Issue 5792, p1387-1388. 2p.
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Source:
Science. 10/10/2008, Vol. 322 Issue 5899, p189-189. 3/4p.
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