It looks like a jellyfish. It swims like a jellyfish. But, the tentacled
artificial creature above, dubbed the "Medusoid," is actually
created by scientists at Caltech and Harvard with rat cells:
It is able to mimic the swimming movement of a jellyfish thanks
to muscle cells from rat hearts which were implanted onto its silicon
frame and grown into a pattern similar to the muscles of a real jellyfish.
By applying an electric current to a container of conducting liquid,
the scientists demonstrated they could "shock" the muscles
into contracting so that it began to move through the water.
Nick Collins of The Telegraph has the story:
here
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