Department of Physiology and Biophysics, School of Medicine, Case Western Reserve University, Cleveland, Ohio, USA

Correspondence and requests for reprints to Professor William C. Stanley Ph D, Department of Physiology and Biophysics, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106-4970, USA

Tel: +1 216 368 5585; fax: +1 216 368 3952; e-mail: [email protected]