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Nature 421, 801-802 (20 February 2003) | doi:10.1038/421801a

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Molecular chaperones: Plugging the transport gap

R. John Ellis

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Molecular chaperones are generally thought to protect newly synthesized proteins and ensure that they fold into the correct shape. But it seems that two chaperones also help to target certain proteins to mitochondria.

Mitochondria are the major energy-producing organelles of animal and fungal cells, and contain more than 700 different proteins. Fewer than 5% of these proteins are encoded by mitochondrial genes and produced inside mitochondria.