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Prolactin levels after r-hPRL or placebo injections. Prolactin levels (mean ± SE) after administration of 60 μg/kg recombinant human prolactin (solid lines) or placebo (dotted lines) on the first (closed circles) and 7th day of injections (open squares), over 6 hours. * designates significant differences in r-hPRL and placebo on the same day at p < 0.05.
