1. Department
of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710, United States
2. Department
of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia 22908, United States
3. Quanticel
Pharmaceuticals, San Francisco, California 94158, United States
4. Smooth Muscle Research Group at the Libin Cardiovascular Institute of Alberta. Department of Biochemistry & Molecular Biology, University of Calgary, 3280 Hospital Drive NW, Calgary, AB T2N 4Z6, Canada