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1 Department of Pharmacology, University of Zürich, Zürich, Switzerland
In the article by Walter Lichtensteiger, Vol. 165, No. 2, February 1969, the following correction should be noted.
In accordance with the P values in Results, the term "99%" (p. 206, column 2, fourth line from bottom) should be replaced by "99.9%" and the term "2.58" (p. 206, column 2, fifth line from bottom; p. 207, column 1, fifth line from top) should read "3.29" (P < .001).