Gray hairs may unlock mysteries of skin cancer WASHINGTON — No doubt many researchers have gotten gray hair trying to find ways to defeat cancer. Now scientists say gray hair itself may yield clues to fighting the deadly disease. It turns out that melanoma, the most dangerous type of skin cancer, involves melanocytes, the cells that help color hair and skin.So researchers at the Dana-Farber Cancer Institute in Boston decided to investigate what happens when these cells become depleted, allowing hair to go gray.“Preventing the graying of hair is not our goal,” said senior researcher David E. Fisher. “What we...