Figure 4.
DAMGO-stimulated [35S]-GTPγS coupling in wild-type and µ-opioid receptor knockout mice. [35S]-GTPγS coupling concentration–response curves for DAMGO were obtained in the brain from wild-type and µ-opioid receptor knockout mice without any treatment. Data are expressed as % of basal level (mean ± S.E.M.) under identical conditions of three independent experiments.