Biodynamic Optical Imaging Center and Department of Life Sciences, Peking University, Beijing, China.|Biodynamic Optical Imaging Center and Department of Life Sciences, Peking University, Beijing, China.|Biodynamic Optical Imaging Center and Department of Life Sciences, Peking University, Beijing, China.|Biodynamic Optical Imaging Center and Department of Life Sciences, Peking University, Beijing, China.|Biodynamic Optical Imaging Center and Department of Life Sciences, Peking University, Beijing, China.