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. Author manuscript; available in PMC: 2010 Jan 5.
Published in final edited form as: Eur J Pharmacol. 2008 Nov 11;602(1):92–100. doi: 10.1016/j.ejphar.2008.11.004

Figure 1.

Figure 1

Effects of the mu agonist fentanyl and the delta opioids SNC243A, MSF61 and naltrindole on rates of schedule-controlled responding. Abscissa: Dose of test drug in mg/kg (log scale). Ordinate: Percent control rates of responding. Each point shows mean ±S.E.M. for 5 monkeys (fentanyl, SNC243A) or 4 monkeys (MSF61, naltrindole).