1. New Crops Research and Biopolymer Research, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, Illinois 61604, National Food Research Institute, 2-1-2 Kannondai, Tsukuba, Ibaraki, Japan 305, and VYSIS, Inc., 3100 Woodcreek Drive, Downers Grove, Illinois 60515