1. Institute of Grassland and Environmental Research, Aberystwyth, United Kingdom
2. Hokuriku University, Kanazawa 920-11, Japan
3. Institute of Child Health, University College London, London, United Kingdom
4. Toyama Medical and Pharmaceutical University, Toyama 930-01, Japan
5. Western Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Albany, CA 94710
6. Poisonous Plant Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Logan, UT 84341