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Source:
Science; 4/7/2017, Vol. 356 Issue 6333, p78-81, 4p, 2 Diagrams, 1 Graph
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Science. March 13, 1992, Vol. 255 Issue 5050, p1450, 2 p.
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Science. June 19, 1998, Vol. 280 Issue 5371, p1863, 2 p. table
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Science. Oct 7, 1988, Vol. 242 Issue 4875, p119, 3 p. cartoon
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