[1] Drexel Univ, Coll Med, Dept Pharmacol & Physiol, Philadelphia, PA 19102 USA
[2] Univ Tokyo, Fac Med, Ctr Dis Biol & Integrat Med, Div Biophys, Tokyo 1130033, Japan
[3] Japan Sci & Technol, Precursory Res Embryon Sci & Technol, Saitama, Japan
[4] Johns Hopkins Sch Med, Solomon H Snyder Dept Neurosci, Baltimore, MD 21205 USA