¹Department of Agricultural Biotechnology, Center for Food Safety and Toxicology, Center for Food and Bioconvergence, Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea, ²Unit on Structural and Chemical Biology of Membrane Proteins, Cell Biology and Neurobiology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA, ³Department of Bioengineering, College of Life Science, Dalian Minzu University, Dalian, 116600, Liaoning, P. R. China, ⁴Electron Microscopy Research Center, Korea Basic Science Institute, Cheongju 28119, Republic of Korea, ⁵Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea¹Department of Agricultural Biotechnology, Center for Food Safety and Toxicology, Center for Food and Bioconvergence, Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea, ²Unit on Structural and Chemical Biology of Membrane Proteins, Cell Biology and Neurobiology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA, ³Department of Bioengineering, College of Life Science, Dalian Minzu University, Dalian, 116600, Liaoning, P. R. China, ⁴Electron Microscopy Research Center, Korea Basic Science Institute, Cheongju 28119, Republic of Korea, ⁵Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea

Corresponding author:  Nam-Chul Ha , Tel: +82-2-880-4853, 

Received: 20 September 2018   • Revised: 26 December 2018   • Accepted: 10 January 2019