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. Author manuscript; available in PMC: 2009 Apr 1.
Published in final edited form as: Psychoneuroendocrinology. 2008 Jan 2;33(3):292–304. doi: 10.1016/j.psyneuen.2007.11.011

Figure 2.

Figure 2

Dose-effect curves for β-endorphin, loperamide and fentanyl, re-plotted from a time of peak effect (15 min post-administration). Upper panel: Mean dose-effect curves (n=4) for each aforementioned compound. Lower panel: Individual subject dose-effect curves for β-endorphin (n=4; re-plotted from above panel). Abscissae are doses in mg/kg (points above “V” represent values obtained after vehicle administration); other details as in Fig. 1. Note ordinate axis break and axis range in lower panel.