In this video segment adapted from NOVA scienceNOW, learn how RNA interference (RNAi), a mechanism that operates in cells to silence gene expression, is being explored by researchers as a therapeutic approach to treating a host of diseases. A genetic malfunction is causing a patient to lose her vision because of the over-production of blood vessels in her eyes. To treat this genetic malfunctioning, scientists attempt to manipulate the mechanism so that genes that normally trigger production of blood vessels instead do the opposite.
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