But it turns out, each mole is a tumor of pigment cells that started on a path to cancer and then stopped.
As hair pigment cells decline in number, gray hair growth increases.
The pigment cells line the outside of each ommatidium.
His skin is lacking pigment cells or something like that.
The pigment cells reside in a narrow band along the shell's lip.
The skin is similar to areas elsewhere, but is relatively thin and has more pigment cells.
With aging, pigment cells die, and hair turns gray.
Some have pigment cells which move across the light detectors during the day, shielding them.
It is due to uncontrolled growth of pigment cells, called melanocytes.
In severe cases, all the pigment cells are lost.