1. From the Integrative Vascular Biology Laboratory, Department of Integrative Physiology, University of Colorado, Boulder (K.J.D., B.L.S., C.A.D., T.D.B., D.L.B., J.J.G., C.A.D.); Department of Medicine, University of Colorado, Denver (B.L.S., C.A.D.); and Department of Medicine, Denver Health Medical Center, CO (B.L.S.).