Affiliation: | (1) Mikrobiologisches Institut, Eidgenössische Technische Hochschule, CH-8092 Zürich, Switzerland;(2) Present address: CSIRO Division of Plant Industry, GPO Box 1600, 2601 Canberra City, ACT, Australia;(3) Present address: Transgène SA, 11, rue de Molsheim, F-67000 Strasbourg, France |