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Merging the RNA and DNA worlds

The demonstrated ability of modern DNA-dependent RNA polymerases to use RNA templates for productive RNA synthesis suggests that they evolved from ancient RNA-dependent RNA replicases.

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Figure 1: RNAP blocks the extension of the persistent RNA duplex.
Figure 2: Putative pathway for the evolution of RNAPs.

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Artsimovitch, I., Vassylyev, D. Merging the RNA and DNA worlds. Nat Struct Mol Biol 14, 1122–1123 (2007). https://doi.org/10.1038/nsmb1207-1122

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