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Time course of neuroendocrine measures. Panels on the left show mean data for cortisol, growth hormone (GH), and prolactin for group 1 (naltrexone, n=11). Panels on the right show mean data for cortisol, GH, and prolactin for group 2 (ketanserin, n=11). The plots show data following placebo+placebo (circle), antagonist (naltrexone or ketanserin)+placebo (square), placebo+salvinorin (triangle), and antagonist+salvinorin (diamond). Error bars denote ±1 SEM.
