Figure 1.

Representative injection sites. Representative injection sites (indicated by arrow) for the ventral (a) and dorsal (b) hippocampus are shown as localization of pontamine sky blue ink (right) and on comparable coronal plane from rat brain atlas (modified from Paxinos and Watson, 6th Ed.). CA1, CA2, CA3, CA fields of the hippocampus; Pyr, pyramidal cell layer hippocampus; Rad, radiatum layer hippocampus; VS, ventral subiculum; MoDG, molecular layer dentate gyrus (refer to the atlas for additional abbreviations).