Center for Chemical Dynamics in Living Cells, Chung-Ang University, Seoul, Korea.|Center for Chemical Dynamics in Living Cells, Chung-Ang University, Seoul, Korea.|Center for Chemical Dynamics in Living Cells, Chung-Ang University, Seoul, Korea.|Department of Chemistry, Chung-Ang University, Seoul, Korea.|Center for Chemical Dynamics in Living Cells, Chung-Ang University, Seoul, Korea.|Center for Chemical Dynamics in Living Cells, Chung-Ang University, Seoul, Korea.