Study illuminates why hair turns gray and bald: Faulty stem cells

Gray hair is caused by melanin-producing stem cells malfunctioning.
Hair follicle stem cells stopping their journey through the follicle and not receiving signals to produce pigment leads to hair graying and loss.
Researchers found that certain stem cells get trapped as people age, losing the ability to maintain hair color.
Unsticking jammed stem cells could potentially reverse or prevent graying hair.
Moving melanocytes to the proper location in hair follicles may prevent hair from turning gray.