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