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Rods are one type of specialised receptor cells in the eyes of vertebrates.
Rods are long and thin in shape - hence their name - and found mainly around the outside of the retina.
Rods contain a large amount of a particular light-sensitive pigment, stacked in disc shapes within the cell, and are mainly responsible for night vision, unlike cones, which are mainly responsible for differentiating between colours.
Animals which can see well at night will have a greater proportion of rods than those - such as humans - which cannot.
Anne Evans
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