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Monkeys implanted with neurons derived from stem cells showed sustained improvement after two years.

Japanese researchers report promising results from an experimental therapy for Parkinson’s disease that involves implanting neurons made from ‘reprogrammed’ stem cells into the brain. A trial conducted in monkeys with a version of the disease showed that the treatment improved their symptoms and seemed to be safe, according to a report published on 30 August in Nature1.

The study’s key finding — that the implanted cells survived in the brain for at least two years without causing any dangerous effects in the body — provides a major boost to researchers’ hopes of testing stem-cell treatments for Parkinson’s in humans, say scientists…

Source: www.nature.com/news/reprogrammed-cells-relieve-parkinson-s-symptoms-in-trials-1.22531