Skin cells around the hair follicle make WNT signals that turn on WNT activity in pigment stem cells in mice.

WNT signals in the hair follicle are linked to pigment cells turning into mature color-producing cells in mice.

Mouse hair pigment cells move between different parts of the hair follicle and change their state back and forth, which is linked to WNT signaling.

When mouse hair starts growing, pigment stem cells in the hair germ turn on color-making and branch-related genes before they divide.