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Scientists have successfully used human stem cells to patch a hole in a monkey's retina, restoring the primate's vision and marking a successful step forward in the quest to treat age-related vision loss., the team led by Michiko Mandai at the Kobe City Eye Hospital in Japan focused on fixing what's called a macular hole, an ocular condition associated with aging.
For their study, the scientists started by growing a sheet of retinal cell precursors, derived from a human embryo.
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