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Fake blood cells so agile they can carry drugs

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You can't get blood from a stone, but it seems you can make imitation red blood cells from polymers.

Just like real blood cells the pretenders can squeeze through spaces much smaller than their own diameter and absorb and release substances to order, including oxygen.

They could be used to disperse drugs, or the contrast agents used in medical imaging, throughout the body with fewer side effects than direct injection.

The fake cells could also be given to people who have lost blood instead of a blood transfusion.
 
 

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