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Before retinal cells die, they regenerate, Penn vet blindness study finds

Until relatively recently, the dogma in neuroscience was that neurons, including the eye's photoreceptor cells, rods and cones, do not regenerate.

This is the reason that nerve damage is thought to be so grave. More recent studies have poked holes in this belief by showing that, in some vertebrate species, neurons can be stimulated to divide.

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