Fluorescent proteins, taken from jellyfish, are a standard workhorse of biology. They let us light up proteins and check on the conditions inside of cells. Now, quantum physicists have shown that they can harness the quantum properties of electrons in these proteins, turning them into exquisitely sensitive sensors of magnetic fields. This also means we can turn them off and on remotely, making them useful for new imaging and therapeutic techniques. Read all about it here!
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