Figure 3: (a-c) Representative examples of immunopositive reactions for c-Fos in the hippocampus (CA4) in samples from Groups 1 (a), 3 (b), and Group 4 (c) (×200). Hippocampal c-Fos expression was not observed in all samples from Groups 1 and 2. Most samples from Group 3 showed strong diffuse staining throughout the cytoplasm, with some also showing staining of the nucleus. Most samples from Group 4 showed staining in the margins of cells, with weaker intensity of staining.