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Making Copies in the RNA World

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Science  18 May 2001:
Vol. 292, Issue 5520, pp. 1278
DOI: 10.1126/science.292.5520.1278a

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By mimicking evolution in the lab, scientists have produced the first RNA enzyme that can make copies of other RNA molecules. The discovery, reported on page 1319, provides a missing piece of evidence for a primitive biological world that existed before DNA and proteins entered the scene.