Credit: Dae Seok Eom, David Parichy
On the left is a close-up view of the skin of an adult zebrafish, with sharply-defined borders between dark and light stripes. On the right is a close-up view of the skin of an adult zebrafish from which macrophage cells have been depleted. In this fish, the borders between dark and light stripes are not sharp, and black pigment cells are found among yellow pigment cells.