Affiliation: | (1) Institut für Genbiologische Forschung GmbH Berlin, Ihnestrasse 63, 33 Berlin, Federal Republic of Germany;(2) John Innes Institute and AFRC Institute of Plant Science Research, Colney lane, NR4 7UH Norwich, UK;(3) Biology Department, University of Essex, Wivenhoe Park, CO4 3SQ Colchester, Essex, UK |