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Science 29 March 1991:
Vol. 251. no. 5001, p. 1567
DOI: 10.1126/science.251.5001.1567-b
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Correction

Editors: DAVID P. HAMILTON.

A recent item (Science, 1 March, p. 1019) incorrectly connected a proposed gene therapy protocol to the University of Pennsylvania. The protocol was actually proposed by the University of Pittsburgh. Science regrets the error.

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