1. Department of Structural Biology, Van Andel Institute, Grand Rapids, Michigan 49503, U.S.A.
2. Department of Pediatrics and Human Development, College of Human Medicine, Michigan State University, Grand Rapids, MI 49546, U.S.A.
3. Department of Pharmacology and Toxicology, College of Human Medicine, Michigan State University, East Lansing, MI 48824, U.S.A.
4. Northwestern University Synchrotron Research Center, Life Sciences Collaborative Access Team, Northwestern University, Argonne, Illinois 60439, U.S.A.
5. Department of Translational Neuroscience, Integrated Mass Spectrometry Unit, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503, U.S.A.