To Defend the Genome, These Cells Destroy Their Own DNA

Marie Delattre was studying the sexual reproduction practices of microscopic worms when she noticed something unexpected. Under the microscope, an embryo of the nematode Mesorhabditis belari was dividing as it should, progressing from one cell to two to four. But inside a few cells she saw an inexplicable spray of DNA fragments floating around where they didn’t belong. “There was DNA everywhere...


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