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Nature 441, xvii (25 May 2006) | doi:10.1038/7092xviia; Published online 24 May 2006

Making the paper: Horacio Frydman

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Bacteria exploit stem cells and their surroundings in order to reproduce.

As a grad student, Horacio Frydman was studying sterile fruitflies when something unusual caught his eye. "One of the mutant lines had a strange pattern of staining in the part of the ovary close to the egg cells," he recalls.