There is some promising news for people with certain types of deafness.
British researchers have re-created new cells in gerbils, which reversed profound hearing loss in some cases.
In a lab, the researchers grew stem cells that came from donated cells, and grew them into healthy replacements.
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When the cells were injected into 18 deaf gerbils, tests showed on average, 45 per cent of their hearing was restored.
Trials on humans could be just a few years away.
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