Distribution of kisspeptin‐immunoreactive (kiss‐ir) fibers within the paraventricular nucleus (PVN) of CD1 (diestrus) female mice, from rostral to caudal sections. Kisspeptin fibers outline the boundaries of the PVN and run along the wall of the third ventricle towards the optic chiasm (ox). A moderate innervation is present also within the supraoptic nucleus (SON), while the suprachiasmatic nucleus (SCN) is almost totally empty of immunoreactivity, as well as the ventromedial hypothalamic nucleus (VMH). f, fornix; *, third ventricle; mt, mammillothalamic tract. Scale bar: 100 μm.