Figure 5From: Melatonin the "light of night" in human biology and adolescent idiopathic scoliosisEffects of exogenous melatonin on nucleus suprachiasmatic neuronal activity (SCN). The effects of melatonin on SCN activity are mediated by at least two different receptors. They are insensitive during the day, but sensitive at dusk and dawn. MT2 causes phase shifts and during early night period MT1 decrease neuronal firing rate and amplitude. (Modified from [89]).Back to article page