1. Department of Molecular and Integrative Physiology (B.C.P., H.L., X.-N.W., Sa.K.D., Su.K.D.), University of Kansas Medical Center, Ralph L. Smith Research Center, Kansas City, Kansas 66160-7338;
2. Department of Pharmacology and Toxicology (J.L.), University of Texas Medical Branch, Galveston, Texas 77555-1031