Figure 5. Photomicrographs (x 100) of the CA1 area of the hippocampus 72 h after 120 min of hyperthermic circulatory arrest. (A) An aptiganel-treated animal with normal-appearing CA1 neurons. (B) A vehicle-treated animal with extensive neuronal degeneration. Hematoxylin and eosin stain, 5-[micro sign]m-thick coronal sections.