Skin starts producing pigment after UV light detected
from Medical News Today
For most people, tanning seems a simple proposition. A naturally light-skinned person lies in the sun for hours and ends up as bronzed as a Jersey Shore star. To scientists, the reaction of skin to ultraviolet light is more mysterious. A new study demonstrates that skin detects UVA radiation using a light-sensitive receptor previously found only in the eye and that this starts melanin production within a couple of hours. Until now, scientists only knew that melanin production occurred days after UVB radiation had already begun damaging DNA.
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