1. From the Department of Pharmacology and Pharmacy, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong (B.B., Y.L., C.X., M.Y.K.L., A.X., P.M.V., Y.W.), and Key Laboratory of Regenerative Biology, Guangzhou Institute of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China (D.W.).