Journal
NATURE
Volume 418, Issue 6894, Pages 222-228Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/418222a
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Although RNA is generally thought to be passive genetic blueprint, some RNA molecules, called ribozymes, have intrinsic enzyme-like activity-they can catalyse chemical reactions in the complete absence of protein cofactors. In addition to the well-known small ribozymes that cleave phosphoclester bonds, we now know that RNA catalysts probably effect a number of key cellular reactions. This versatility has lent credence to the idea that RNA molecules may have been central to the early stages of life on Earth.
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