1. From the State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain Research (Y.C., A.W., J.T., Z.Z.) and BABRI Centre (Y.C., A.W., J.T., D.W., P.L., K.C., Y.W., Z.Z.), Beijing Normal University, Beijing, China; Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, Beijing, China (D.W., P.L., Y.W.); and Banner Good Samaritan PET Center, Banner Alzheimer’s Institute, Phoenix, AZ (K.C.).