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RNA repair has now been demonstrated to be a genuine biological process and appears to be present in all three domains of life. In this article, we consider what this might mean for the transition from an early RNA-dominated world to modern cells possessing genetically encoded proteins and DNA. There are significant gaps in our understanding of how the modern protein-DNA world could have evolved from a simpler system, and it is currently uncertain whether DNA genomes evolved once or twice.doi:10.1093/molbev/msi132 pmid:15774424 fatcat:3dvbrdge5vg67pacduhlqt3vji