School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 OEX, United Kingdom; Syngenta, Jealott's Hill Research Station, Bracknell, Berks RG42 6EY, United Kingdom; Kirin Brewery, Central Laboratories for Key Technology, 1-13-5 Fukuura, Kanazawa-ku, Yokohama-shi 236, Japan; and Syngenta Wheat Improvement Centre, Norwich Research Park, Norwich NR4 7UH, United Kingdom (At 2002-01-22)