1. Laboratory of Integrative Brain Sciences (V.S.C., K.Y., T. U., K.T.), Department of Biology, Waseda University, and Center for Medical Life Science of Waseda University, Tokyo 162-8480, Japan
2. Department of Integrative Biology and Helen Wills Neuroscience Institute (G.E.B.), University of California at Berkeley, Berkeley, California 94720-3140
3. Department of Biology (A.H.), Tokyo Medical and Dental University, Chiba 272-0827, Japan