Figure 1
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1746-4358-2-10/MediaObjects/13006_2007_Article_39_Fig1_HTML.jpg)
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.