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Science 1 October 1993:
Vol. 262. no. 5130, p. 16
DOI: 10.1126/science.262.5130.16-b
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Corrections and Clarifications

The title of the Perspective by Christopher Miller in the issue of 24 September (p. 1692) was printed incorrectly. It should have read, "Potassium selectivity in proteins: Oxygen cage or pgr in the face?" In the figure caption on the same page, "-electron" was printed incorrectly instead of "pgr-electron."

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