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In the article by Racker and Kadish that appeared in a previous issue of the journal (Circulation 2000;101:1049–1059), Figures 2⇓, 3⇓, 6⇓, and 9⇓ did not reproduce well. Better quality images follow.
In addition, the final sentence of the Methods and Results section of the Abstract should read as follows: “Sheaves of nerve terminals are found, including boutons as in skeletal muscle.”