A nonenzymatic RNA copying reaction using substrates activated with 2-aminoimidazole (yellow) is catalyzed by ribozymes. (IMAGE)

Proceedings of the National Academy of Sciences

A nonenzymatic RNA copying reaction using substrates activated with 2-aminoimidazole (yellow) is catalyzed by ribozymes.

Caption

A nonenzymatic RNA copying reaction using substrates activated with 2-aminoimidazole (yellow) is catalyzed by ribozymes.

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Image Courtesy of Travis Walton

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