Representative lesions in the hippocampus. A) Brain sections from 3 animals with different levels of hippocampal lesions. Lesioned hippocampal tissue is shown using black traces. Scale bar: 1 mm. B) Representative schematics of equally spaced brain sections illustrating various degrees of hippocampal lesions in TS097 (left), TS103 (middle), and TS099 (right). Shadings indicate hippocampal lesions. Numbers on top of schematic indicate volume of healthy hippocampus in each hemisphere. Numbers at bottom left refer to distance posterior to Bregma. Brain profiles in panel b were adapted from The tree shrew (Tupaia belangeri chinensis) brain in stereotaxic coordinates (Zhou and Ni 2016) with permission.