Love at first sight.
- A female presence increases GnIH hormone precursor mRNA expression in the brain and decreases luteinizing hormone (LH) concentration in the plasma of males;
- A female presence increases norepinephrine (NE) release in the hypothalamus of males;
- NE stimulates the release of GnIH from the hypothalamus in vitro and inhibits plasma LH secretion;
- NE neurons project to GnIH neurons that express NE (noradrenergic α2A subtype) receptor mRNA.