Yu Sun, Jun Yao, Tae-Wan Kim and Alan R. Tall. From 1: Division of Molecular Medicine, Department of Medicine, 2: Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Department of Pathology, College of physicians and Surgeons, Columbia University, New York, NY 10032. *To whom correspondence should be addressed: Tel: 212-305-9418; Fax: 212-305-5052; E-mail: art1@columbia.edu Running title: LXR activation decreases Aβ