*Chen Cian Cian¹, Cheng Cheng Yi³, Yang You Ping⁴, Ma Kuo Hsing^2,4 (1. Graduate Institute of Life Sciences, National Defense Medical Center, Taiwan, 2. GradInstitute of Biology and Anatomy,National Defense Medical Center,Taiwan, 3. Department of Nuclear Medicine, Tri-Service General Hospital, National Defense Medical Center, 4. Brain research center,National Defense Medical Center, Taiwan)