1. Y. H. Jeon, T. Yamazaki, Y. Kyogoku, Institute for Protein Research, Osaka University, Suita, Osaka 565, Japan.
2. T. Negishi, N. Fujita, A. Ishihama, Department of Molecular Genetics, National Institute of Genetics, Mishima, Shizuoka 411, Japan.
3. M. Shirakawa, Graduate School of Bioscience, Nara Institute of Science and Technology, Takayama, Ikoma, Nara 630-01, Japan.