[caption id="attachment_5635" align="aligncenter" width="584"] Representative dendrites of dentate gyrus neurons of Siberian hamsters injected with melatonin (stained with Cresyl violet). Ikeno et al found hamsters injected with melatonin displayed decreased spine density on neurons in the dentate gyrus. Image courtesy of Tomoko Ikeno, Ph.D.[/caption] Night falls and a powerful hormone called melatonin kicks in. The gears of the circadian clock are turning as you get ready...
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