1. Department of Molecular (P.B., R.J.D.), Cellular and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109-1048
2. Bayer Healthcare Pharmaceuticals (T.Z., S.A.B.), Research Laboratories, 13353 Berlin, Germany
3. Department of Biological Science (R.M.B.), University of Tulsa, Tulsa, Oklahoma 74104-3189
4. Molecular and Behavioral Neuroscience Institute (A.M.R., A.S.), University of Michigan, Ann Arbor, Michigan 48109-5720
5. Cellular and Molecular Biology Program (A.M.R.), University of Michigan, Ann Arbor, Michigan 48109-5720