Norepinephrine Dialysate Levels in the Hypothalamic Paraventricular Nucleus: Influence on Photoperiod-Driven Prolactin Levels in the Female Siberian Hamster

Basal prolactin (PRL) levels in Siberian hamsters are modulated by ambient photoperiod via the nocturnal melatonin signal. Recent evidence from our laboratory has demonstrated that norepinephrine (NE)