1. Laboratories of Integrative Biology (B.N.F., R.W.J.), University of Illinois, Urbana, Illinois 61801
2. Immunophysiology (K.W.K.) Department of Animal Sciences, University of Illinois, Urbana, Illinois 61801
3. Laboratory of Integrative Neurobiology, INRA-INSERM, U-934 (R.D.), 33077 Bordeaux, France