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He looks directly at the pen and can now see that it is
red. Which light-sensitive cells are being used to make
the image now?

Answer :

Answer:

Thanks to the rod and cone cells in our eyes, our brains can use light to build images. Recent studies identified a third type of cell that responds to light and dark. Three research groups have now confirmed that melanopsin is the pigment that this cell-type uses, opening possible avenues for treating blind people.

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