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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 4.

Figure 4

β-endorphin (0.1 mg/kg; i.v.) pretreatment administered 5 min before loperamide (0.32 mg/kg; i.v.). Data are n=3; subject MAR was excluded due to lack of response to loperamide alone (see Table 1).