Affiliation: | (1) Department of Systems Science, State University of New York, Binghamton, 13901 New York, NY, USA;(2) Present address: Department of Biology, University of Chile, Casilla 653, Santiago, Chile;(3) Cavendish Laboratory, Madingley Road, CB3 0HE Cambridge, England;(4) Present address: La Jolla Institute, P.O. Box 1434, 92038 La Jolla, CA, USA |