Hidden red hair gene a skin cancer risk
The Sanger Institute team estimate one in every four UK people is a carrier. The gene's effect is comparable to two decades of sun exposure in terms of cancerous changes, they say.

While people with two copies of the gene will have ginger hair, freckles and pale skin and probably know to take extra care in the sun, those with one copy may not realize they are at risk.

Read more: http://www.bbc.com/news/health-36762630
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