Sun Damage to Skin Can Continue After Dark

February 20, 2015 10:04 PM

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Researchers exposed mouse and human melanocytes to UV radiation. In melanocytes with melanin, DNA damage occurred not only immediately, but also hours after UV exposure ended. In melanocytes that didn't have melanin, the damage occurred only during UV exposure.

It was thought that melanin protected the skin by blocking UV light, but this study found that melanin has both protective and harmful effects. "If you look inside adult skin, melanin does protect against cyclobutane pyrimidine dimers. It does act as a shield. But it is doing both good and bad thing...

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