1. Animal Disease Control Division, National Veterinary Research and Quarantine Service, Anyang 430-824, Korea.
2. Biosafety Research Institute, College of Veterinary Medicine, Chonbuk National University, Jeonju 561-712, Korea.
3. Biotherapy Human Resources Center, College of Veterinary Medicine, Chonnam National University, Gwangju 500-757, Korea.
4. Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Konkuk University, Seoul 143-701, Korea.
5. Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, 12211-Giza, Egypt.