1. Department of Macromolecular Science and Engineering; University of Michigan; Ann Arbor Michigan
2. Department of Anesthesiology; University of California San Diego; La Jolla California
3. Program in Neuroscience; University of California San Diego; La Jolla California
4. Department of Chemical Engineering and Materials Science; Michigan State University; East Lansing Michigan
5. Department of Neuroscience; University of California San Diego; La Jolla Califronia
6. Veterans Administration Medical Center; La Jolla California
7. Department of Mechanical Engineering; University of Michigan; Ann Arbor Michigan