Page last updated at 18:24 GMT, Friday, 20 August 2010 19:24 UK

Venezuelan village key in search for Huntington's cure

The village of Barranquitas in Venezuela has the highest concentration of Huntington's disease, a devastating brain condition, in the world.

The BBC's Will Grant accompanies US scientist Nancy Wexler there as she continues her life's work to find a cure.

Broadcast on Thursday 19 August 2010.

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