1. Department of Physiology and Biophysics, Seoul National University, College of Medicine, 28 Yonggon‐dong, Chongno‐gu, Seoul 110‐799, Korea
2. Ion Channel Group, Department of Cell Physiology and Pharmacology, University of Leicester, PO Box 138, Leicester LE1 9HN, UK
3. Ion Channel Group, Department of Chemistry, University of Leicester, PO Box 138, Leicester LE1 9HN, UK