Stem cells can produce all embryonic cells types, but only rarely generate placental cells. But a new study reveals that removing a specific microRNA from mouse stem cells can change their nature, allowing them to consistently produce extra-embryonic cells such as placental cells in a Petri dish.

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Stem cells can produce all embryonic cells types, but only rarely generate placental cells. But a new study reveals that removing a specific microRNA from mouse stem cells can change their nature, allowing them to consistently produce extra-embryonic cells such as placental cells in a Petri dish.