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. 2005 Feb 10;102(8):3093–3098. doi: 10.1073/pnas.0409888102

Fig. 2.

Fig. 2.

AM1241 (i.p.) produced dose-dependent antinociception in wild-type (μ+/+) mice but not in μ-opioid receptor knockout (μ-/-) mice. Data are expressed as mean ± SEM. n = 6 per group. #, P < 0.05 compared with μ+/+ mice.