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NEW YORK (GenomeWeb) – Researchers have uncovered 20 genetic loci that may explain why some people burn while others tan in response to sun exposure.

Whether or not someone can tan is determined by the ability of melanocytes to ramp up melanin production after exposure to ultraviolet radiation, and burning, rather than tanning, is a risk factor for developing skin cancer. In the US alone this year, about 91,270 new cases of melanoma are expected, according to the National Cancer Institute.

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