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Artificial jellyfish created from heart cells

23 July 2012 Last updated at 17:20 BST

Scientists in the US have shown off a free swimming artificial jellyfish.

Video footage shows how the replica closely mimics the swimming behaviour of a real jellyfish.

The team members built the replica using silicone as a base on which to grow heart muscle cells from rats.

They used an electric current to shock the artificial animal into swimming with synchronised contractions.