1. Laboratory of Immunophysiology (R.A.F., S.R.B., C.M., S.A., K.W.K.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
2. Department of Animal Sciences, and Department of Veterinary Pathobiology (W.A.M., J.F.Z.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
3. Institut National de la Recherche Agronomique-Institut National de la Santé et de la Recherche Médicale Unité 394, Unité de Recherches de Neurobiologie Intégrative (R.D.), Institute François Magendie, 33077 Bordeaux, France