1. Department of Chemistry and Biochemistry, University of California─Los Angeles, Los Angeles, California 90095, United States
2. Australian Proteome Analysis Facility, Macquarie University, Macquarie Park, New South Wales 2109, Australia
3. Department of Neurology and Brain Research Institute, David Geffen School of Medicine at UCLA, University of California─Los Angeles, Los Angeles, California 90095, United States
4. The Pasarow Mass Spectrometry Laboratory, The Jane and Terry Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at UCLA, University of California─Los Angeles, Los Angeles, California 90095, United States
5. Institute of Chemistry, University of Duisburg-Essen, Essen 45141, Germany
6. Molecular Biology Institute, University of California─Los Angeles, Los Angeles, California 90095, United States
7. Department of Biological Chemistry, David Geffen School of Medicine at UCLA, University of California─Los Angeles, Los Angeles, California 90095, United States