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Textbooks challenged by new discovery about how cells divide
General • February 28, 2026
Scientists have
uncovered a
surprising new way that giant embryonic cells divide—without
relying on the classic “purse-string” ring long thought essential for splitting a cell in two. Studying zebrafish embryos, researchers found that instead of forming a fully closed contractile ring, cells use a clever “mechanical ratchet” system.
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