1. C. Rosenmund, Workgroup Cellular Neurobiology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany.
2. Y. Stern-Bach, The Hebrew University–Hadassah Dental School, Department of Anatomy and Embryology, Post Office Box 12272, Jerusalem, Israel.
3. C. F. Stevens, Howard Hughes Medical Institute, The Salk Institute, La Jolla, CA 92037, USA.