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Scientists Accelerate Frog Leg Re-Growth

Scientists treated amputated frogs with a bioreactor filled with progesterone and observed limb regrowth. The paper can be found at

The scientists 3-D printed the bioreactor out of silicon and filled it with hydrogel—a sticky glob of polymers. They laced the hydrogel with hydrating silk proteins that promote healing and regeneration, then added progesterone. Progesterone is best known for its role in preparing the uterus for pregnancy, but the hormone has also been shown to promote nerve, blood vessel, and bone tissue repair.

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