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Effect of treatment with two different opioids on T lymphocyte proliferation in a rat model of bone cancer pain. T lymphocyte proliferation in the β-EP group was stronger than that of the morphine group. *P<0.05 and **P<0.01, vs. the sham surgery group; •P<0.05 vs. the morphine group. n=8–10. β-EP, β-endorphin.
