1. Department of Physiology, School of Dentistry, Seoul National University and Dental Research Institute, Seoul 110-749, Korea
2. Department of Carbon Convergence Engineering, Wonkwang University, Iksan, Jeonbuk 54538, South Korea
3. Department of Chemistry, Center for Nature-inspired Technology (CNiT), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea