1 Departments of Molecular Medicine and Neuroscience, Neurodegeneration New Medicines Center, The Scripps Research Institute, La Jolla, CA, USA.
2 Department of Medicine, University of California, San Diego, La Jolla, CA, USA.
3 VA San Diego Healthcare System, San Diego, CA, USA.
4 Departments of Molecular Medicine and Neuroscience, Neurodegeneration New Medicines Center, The Scripps Research Institute, La Jolla, CA, USA. slipton@scripps.edu.
5 Department of Neurosciences, School of Medicine, University of California, San Diego, La Jolla, CA, USA. slipton@scripps.edu.