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Page last updated at 09:49 GMT, Tuesday, 24 January 2012

'Promising' stem cell trials for blindness

The first trials on a treatment for sight loss using embryonic stem cells has produced early results that researchers describe as "groundbreaking" on patients suffering from the condition, macular degeneration.

Daniel Brison, professor of clinical embryology and stem cell biology at Manchester University outlines why he's cautiously optimistic about the findings.

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