From the Institute of Molecular Pharmacology and Biophysics (J.N.M., I.B., G.V., A.S.) and the Department of Cell Biology, Neurobiology, and Anatomy (J.N.M., G.V.), University of Cincinnati Medical Center, Cincinnati, Ohio; and the Department of Pathology (W.L.), Emory University, School of Medicine, Atlanta, Ga. (At 2001-01-02)