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Endogenous cAMP levels in the hippocampus of naive, shocked, or trained animals killed at different time intervals after training. Data are expressed as mean ± SE pmol/mg tissue of six to nine independent experiments done by triplicate. ∗, P < 0.01; ∗∗, P < 0.001 compared with naive controls, Tukey–Kramer test after ANOVA.
