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Unilateral IBO injection had no effect on hippocampal learning. A, B, Images showing the sequential horizontal hippocampal sections from the dorsal to the ventral part of the hippocampus from PBS-injected (A) and IBO-injected (B) rats after cresyl violet staining. Scale bar, 200 μm. C, Experimental schedule and average freezing response observed in PBS- and IBO-injected rats during test sessions for the CFC task (unpaired t test, p = 0.66, t9 = 0.44; IBO, n = 6; PBS, n = 5 rats).
