1. Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea.
2. Department of Pharmacognosy, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea.
3. Department of Pharmacology, School of Medicine, Chung-Ang University, Seoul 156-756, Korea.
4. Department of Pharmacology, School of Medicine, Kyungpook National University, Daegu 700-422, Korea.
5. Department of Pharmacology, College of Medicine, Dankook University, Cheonan 330-714, Korea.
6. Department of Medicinal Plant Science, College of Science and Engineering, Jungwon University, Chungbuk 367-805, Korea.