This has been linked to the MC1R gene mutation, which affects pain receptors. Red hair in close-up. (credit: Wikimedia Commons) Redheads commonly have green or blue eyes—a rare and unique ...

The researchers found that people who carried the MC1R variant had about 42 percent more sun-associated mutations in their tumors. Ultraviolet (UV) light—like that from the sun—can damage DNA, and ...