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Anxiety measures in the defensive prod burying test. MOR opioid receptor antagonist (FNA) administration significantly increased the latency to bury the prod following shock. Diazepam (3mg/kg) administration decreased the duration of burying following shock, suggesting an anxiolytic effect of diazepam. The anxiolytic influences of diazepam were not modified by either naltrindole (NTI) or FNA. Data are shown as means ± SEM, n=7–11/group
