Affiliation: | (1) Norwich Molecular Plant Pathology Group, University of East Anglia, School of Biological Sciences, NR4 7TJ Norwich, UK;(2) Present address: SmithKline Beecham, The Frythe, Welwyn, Herts, UK;(3) Present address: Institute of Food Research Norwich, Colney Lane, Norwich, UK;(4) Present address: Biotech International, Technology Park, Bentley, Western Australia |