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Proceedings of the National Academy of Sciences of the United States of America. 4/29/2003, Vol. 100 Issue 9, p5378. 6p. 17 Color Photographs, 49 Black and White Photographs, 1 Diagram, 16 Graphs.
Proceedings of the National Academy of Sciences of the United States of America. 3/4/2003, Vol. 100 Issue 5, p2700. 6p. 17 Color Photographs, 1 Black and White Photograph, 10 Graphs.