1. Section of Immunobiology and Department of Molecular Biophysics and Biochemistry, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06510, USA.
2. Department of Biology,
3. Center for Ligand and Transcription and
4. Department of Microbiology,
5. Hormone Research Center, Chonnam National University, Kwangju 500-757, Korea.