How a DNA ‘Parasite’ May Have Fragmented Our Genes

All animals, plants, fungi and protists — which collectively make up the domain of life called eukaryotes — have genomes with a peculiar feature that has puzzled researchers for almost half a century: Their genes are fragmented. In their DNA, the information about how to make proteins isn’t laid out in long coherent strings of bases. Instead, genes are split into segments…

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