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Figure 4 | SpringerPlus

Figure 4

From: The melanocyte photosensory system in the human skin

Figure 4

Response to light cycles: Dendricity, serotonin, and melatonin during [a] seasonal cycles and [b] the diurnal photophase. [c] Depicts the phase response curves, near the poles, measuring length of the photophase, with the serotonin/melatonin flux, during transit from winter, with short curves to summer with lengthening curves. [d] Correction of the serotonin/melatonin rhythm by phototherapy during long dark phase in winter.

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