The naked little animal arm in this video is no ordinary limb. According to a report by the New Scientist, it’s the world’s first bioengineered rat limb grown in a lab from living cells. In a study published in the journal Biomaterials, a team of researchers from the Ott Laboratory at Massachusetts General Hospital MGH explained how they grew the rat limb in a bid to push forward the development of bioartificial limbs, which might someday be suitable for transplantation. Bioengineering techniques have been used previously to grow individual organs like hearts and lungs. But what’s particularly cool about this experiment is that the researchers have been able to grow a whole animal limb.

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