Retraction

NEUROBIOLOGY. For the article “Sodium channels in the cytoplasm of Schwann cells” by J. M. Ritchie, J. A. Black, S. G. Waxman, and K. J. Angelides, which appeared in number 23, December 3, 1990, of Proc. Natl. Acad. Sci. USA (87, 9290–9294), K. J. Angelides has agreed to retract the results.