1. Department of Biochemistry, Centenary Campus, P1/12, CIT Scheme 7 M, Bose Institute, Calcutta 700 054, India, Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India, and Laboratory of Seeds Finding Technology, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba, Ibaraki 300-2635, Japan