BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Light micrograph showing a transverse section through rods and cones in the retina of the eye. Rods are long nerve cells which respond to dim light, enabling images to be detected. Cones are shorter cells which detect colour. Rods and cones pass visual signals through the optic nerve to the brain.
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