1. Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104; Cell Genesys, Foster City, CA 94404
2. Institute for Human Gene Therapy, University of Pennsylvania, Philadelphia, PA 19104
3. Department of Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637
4. Section of Cardiology, Department of Medicine, University of Chicago, Chicago, IL 60637
5. Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104