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Source:
Science (1880 to 2025). 2/1/2002, Vol. 295 Issue 5556, p832-834. 3p. 2 Diagrams.
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Source:
Science (1880 to 2025). 8/20/2004, Vol. 305 Issue 5687, p1136-1138. 3p.
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Source:
Science (1880 to 2025). 8/6/2004, Vol. 305 Issue 5685, p849-851. 3p. 3 Diagrams, 1 Chart.
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