Institution: | (1) Department of Plant Biology, University of Groningen, Biological Center, NL-9751 NN Haren, The Netherlands;(2) Medical Biological Laboratory TNO, P.O. Box 45, NL-2280 AA Rijswijk, The Netherlands;(3) Present address: ATO-agrotechnology, Post Box 17, NL-6700 AA Wageningen, The Netherlands |