1. From the Vascular Signaling Group, Institut für Kardiovaskuläre Physiologie (I.F., A.R., R.P., B.F., S.S., A.S., R.B.), and Molecular Cardiology (J.H.), Department of Internal Medicine III, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany; the Department of Biochemistry (J.R.F.), University of Texas Southwestern Medical Center, Dallas; and the Department of Entomology (C.M., B.D.H.), University of California, Davis.