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Li and his team undertook to learn the role of these bundles of mitochondria by analyzing the cones of a ground squirrel, a small mammal that has amazing vision during the day but is practically night blind because its photoreceptors are disproportionately cones. Instead of being obstacles, the mitochondrial bundles seem to play a critical role in helping to funnel as much light as possible to the photoreceptors with minimal loss, Li said.
Li and his colleagues think that what they saw in ground squirrels is also likely to occur in humans and other primates, who have very similar cone structures. They suggested that it could even explain a phenomenon,in 1933 and called the Stiles-Crawford effect, in which light passing through the very center of the pupil is perceived as brighter than light entering at an angle.
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