It’s called a medusoid, and if that sounds like something straight from science fiction, it is. According to an article in Nature, “bioengineers have made an artificial jellyfish using silicone and muscle cells from a rat’s heart. The synthetic creature, dubbed a medusoid, looks like a flower with eight petals. When placed in an electric field, it pulses and swims exactly like its living counterpart.”
This work could ultimately be used to build models of the human heart and test drugs against it.
The field of synthetic biology is scary stuff but …you haven’t seen anything yet