1Institute of Physiology and Pathophysiology, Division of Cardiovascular Physiology, University of Heidelberg, D-69120 Heidelberg, Germany.
2Institute of Pharmacology, University of Heidelberg, D-69120 Heidelberg, Germany.
3Laboratory of Neurobiology, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA.
↵§To whom correspondence should be addressed. E-mail: hecker{at}physiologie.uni-hd.de
↵* These authors contributed equally to this work.
↵† Present address: University of British Columbia Centre for Blood Research, 2350 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada.
↵‡ Present address: Centre Hospitalier Universitaire Vaudois, Department of Internal Medicine, CH-1011 Lausanne, Switzerland.
3Laboratory of Neurobiology, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA.