Electron microscopic visualization of the tetrodotoxin-binding protein from Electrophorus electricus: Ellisman, M. H., Agnew, W. S., Miller, J. A. and Levinson, S. R. (Department of Neurosciences, School of Medicine, University of California at San Diego, La Jolla, California 92093, Department of Physiology, Yale University, New Haven, Connecticut 06510, and Department of Physiology, University of Colorado Medical School, Denver, Colorado 80262, U.S.A.) Proc. natn. Acad. Sci. U.S.A.79, 4461 (1982)