1. Department of Biochemistry; Chung-Ang University College of Medicine; 221 Heukseok-dong, Dongjak-gu Seoul 156-756 Korea
2. College of Pharmacy, Chung-Ang University; 221 Heukseok-dong, Dongjak-gu Seoul 156-756 Korea
3. Department of Dermatology; Seoul National University College of Medicine; 28 Yongon-dong, Chongno-gu Seoul 110-744 Korea
4. Department of Dermatology; Seoul National University Bundang Hospital; 166 Gumi-ro, Bundang-gu Seongnam-si Gyeonggi-do 463-707 Korea