Department of Neurobiology;
School of Medicine;
Soochow University;
Suzhou 215123;
China;
Department of Physiology;
School of Medicine;
Showa University;
Tokyo 142-8555;
Japan;
Now in Department of Physiology;
School of Preclinic Medicine;
Nanjing University of Traditional Chinese Medicine;
Nanjing 210046;
China;