1. Department of Pharmacology, and Institute for Medical Science, Chonbuk National University Medical School, Jeonju 560-182, Korea.
2. Department of Microbiology, and Institute for Medical Science, Chonbuk National University Medical School, Jeonju 560-182, Korea.
3. Department of Physiology, and Institute for Medical Science, Chonbuk National University Medical School, Jeonju 560-182, Korea.