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Science 3 August 1990:
Vol. 249. no. 4968, p. 466
DOI: 10.1126/science.466-c
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Erratum

Beth A. Snyder, not Ralph L. Nicholson, should have received credit for the cover photograph of 29 June 1990.

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