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Percentage of maximum possible effects of 2-BFI and μ-opioid receptor ligands on CFA-induced mechanical nociception (n = 6/group) (top), CFA-induced thermal nociception (n = 6/group) (middle), and schedule-controlled responding (n = 8) (bottom). Ordinates: percentage of maximum possible effects (top and middle) or percentage of control responding rate (bottom); abscissa: drug doses (mg/kg, i.p.). PWT, paw withdrawal threshold.
