1. Department of Physiology, Southern Medical University, 1838 Guangzhou Avenue, North Baiyun District, Guangzhou, Guangdong 510080, China
2. Institute of Genetic Engineering, Southern Medical University, 1838 Guangzhou Avenue, North Baiyun District, Guangzhou, Guangdong 510080, China
3. Laboratory of Electron Microscopy, Southern Medical University, 1838 Guangzhou Avenue, North Baiyun District, Guangzhou, Guangdong 510080, China