Interactions of the echinoderm toxin Holothurin A and its desulfated derivative with the cat superior cervical ganglion preparation: S. L. Friess, J. D. Chanley, W. V. Hudak and H. B. Weems, Toxicon, 1970, 8, 211. (Physiological Sciences Department, Naval Medical Research Institute, Bethesda, Maryland, and Department of Biochemistry, Mount Sinai Medical and Graduate Schools, New York City, U.S.A.)