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Science 29 July 1994:
Vol. 265. no. 5172, p. 591
DOI: 10.1126/science.265.5172.591-a
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Corrections and Clarifications

In the Perspective by Donald G. York (8 July, p. 191), figure 1 was printed incorrectly. The correct figure and caption appear below.

[See figure in the PDF file]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)