1. A rhabdomeric photoreceptor cell forms with a pigment cell a simple eye. 2. Pigment cells of the iris pigment epithelium have a separate embryological origin.3. The pigment cells , called chromatophores, are derived from the neural crest. 4. Part of the pigment cells , and without it, skin and hair cells lack pigment. 5. These eyes contain more photoreceptor cells that are shaded by pigment cells forming a cup. 6. The skin colour of amphibians is produced by three layers of pigment cells called chromatophores. 7. Skin color is produced via pigment cells called chromatophores. 8. Hair turns gray as pigment cells at the root of hair follicles stop producing melanin. 9. The pigment cells line the outside of each ommatidium. 10. Each ommatidium contains eight photoreceptor cells ( R1-8 ), support cells, pigment cells , and a cornea.
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