Going gray may be more than just a sign of aging—it could reflect the body’s natural defense against cancer, according to new research exploring how hair follicle stem cells respond to DNA damage. The average age for graying is mid-thirties in Caucasians, late thirties in Asians and mid-forties in Africans—yet only 6 to 23 percent of people aged 45 to 65 have more than half of their hair turning gray. Throughout one's life, cells are constantly exposed to environmental and internal factors that

Tag-uri: DNA