Researchers deliver CRISPR-Cas9 directly into the inner ear hair cells of mice, preventing hearing loss in animal model of genetic progressive deafness. Above – Credit : Gao et al./Nature 2017. Confocal microscopy images of mouse cochlea; hair cells in green. (Left) An untreated cochlea from a mouse with the Tmc1 mutation, displaying hair cell loss. (Right) The opposite, treated, cochlea from the same mouse, displaying hair cell preservation. Hearing loss is the most common form of sensory loss in humans, and almost half of cases have an underlying genetic cause. Reporting today in Nature, a team led by researchers from

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