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Effects of bilateral intrahippocampal infusion of vehicle or forskolin (0.5 μg/side) on step down latency. Data are expressed as in Fig. 1. Number of rats ranged between 9 and 12 per group. Training test differences were significant at P < 0.001 by Mann–Withney U tests (two tailed). ∗, P < 0.02; ∗∗, P < 0.002 in comparison with test session values of vehicle group (Mann–Whitney U test).
