Progeny of the protist Paramecium tetraurelia always retain the parental mating type. This inheritance is revealed to result from an RNA-guided DNA-deletion pathway that protects the genome from foreign DNA sequences. See Article p.447
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Chalker, D. Keeping one's sex. Nature 509, 430–431 (2014). https://doi.org/10.1038/nature13333
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DOI: https://doi.org/10.1038/nature13333
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