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1 Department of Pharmacology, Division of Basic Health Sciences, Emory University, Atlanta, Georgia
In the article by Alice R. Johnson and Neil C. Moran, Vol. 189, No. 1, April 1974, the following corrections should be noted.
The magnification factors given in figures 9 and 10 should be as follows: figure 9, x500; figure 10, x600 instead of x 1200 and x 1500, respectively.