Figure 2. Diagrammatic representation of the control of production and the functions of melatonin, with regard to seasonal and circadian timing mechanisms. Abbreviations: SCN: suprachiasmatic nucleus, PVN: paraventricular nucleus, SCG: superior cervical ganglion, NA: norepinephrine (noradrenalin), RHT: retino-hypothalamic-tract, CCG: clock-controlled genes. Based on an original diagram by Dr Elisabeth Maywood, MRC Laboratory of Molecular Biology, Neurobiology Division, Hills Road Cambridge, CB2 2QH, UK.