1. Laboratory of Seeds Finding Technology, Eisai Co., Ltd, Tokodai 5-1-3, Tsukuba, Ibaraki 300-2635, Japan, Applied Biosystems, 500 Old Connecticut Path, Framingham, Massachusetts 01701, and Amersham Biosciences K.K., Sanken Building, Hyakunincho 3-25-1, Shinjyuku, Tokyo 169-0073, Japan