Institution: | (1) Department of Biology, Virginia Polytechnic Institute and State University, 24061 Blacksburg, Virginia, USA;(2) Present address: Department of Veterinary Physiology & Pharmacology, Texas A & M University, 77843 College Station, TX, USA;(3) Department of Physiology, 780 A Quillen-Dishner College of Medicine, East Tennessee State University, Box 19, 37614 Johnson City, TN, USA |