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Implantable optical fibers might light up early signs of disease

Using pulses of light to stimulate cells in the brain, an emerging field known as optogenetics, has some real potential as a form of therapy. Reversing blindness, blocking pain and resetting our biological clocks are just a few areas where this technique could prove useful, but due to the mushy contents inside our skulls, scientists have to be very careful about what they use as a light source.
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