Figure 1.
The effect of β-endorphin (10−8 M; β-End), naltrexone (10−8 M; Nalt), NP (600 μM), and their combinations on LHRH release from MBH incubated in vitro. In this and subsequent figures, the height of the column represents the mean and the vertical line represents 1 SEM. Significantly different from control: ∗, P < 0.05, ∗∗, P < 0.01; ∗∗∗, P < 0.001. a, Not significantly different from other columns labeled with a. b, Significantly different from columns labeled with a. n = 8 for each column.