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The concentration-effect curves of DAMGO in vehicle (0.02% DMSO), DAMGO (5 μM), Morphine (5 μM), NFP (1 μM), naltrexone(1 μM), and nalbuphine (1 μM) pretreated mMOR-CHO cells. Data presented means ± S.E.M. and repeated at least 4 times in independent experiments (Obeng et al., 2019).
