Influence of impairment of excitatory input on ischemia induced hippocampal damage in rats : N.H. Diemer, M.B. Jørgensen, F.F. Johansen, M.J. Sheardown ∗ & T. Honore ∗, Institute of Neuropathology, University of Copenhagen, and ∗A/S Ferrosan, CNS Division, Sydmarken 5, DK-2860 Soeborg, Denmark