1. Plant Research International BU Cell Cybernetics P.O. Box 16, 6700 AA Wageningen, The Netherlands r.d.hall@plant.wag-ur.nl
2. IACR-Long Ashton Bristol BS41 9AF, United Kingdom
3. MPI Molecular Plant Physiology Postfach 14424 Potsdam, Germany
4. Department of Computer Science University of Wales, Penglais Aberystwyth SY23 3DB, United Kingdom
5. Samuel Roberts Nobel Foundation Plant Biology, P.O. Box 2180 Ardmore, OK 73402
6. Plant Research International BU Cell Cybernetics P.O. Box 16, 6700 AA Wageningen, The Netherlands