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The front cover illustrates the in vivo imaging and controlled swimming of a swarm of microrobots in deep tissue, which is described in detail by K. Kostarelos, B. J. Nelson, and co‐workers on page 2981. These microrobots, called artificial bacterial flagella (ABFs), are similar in size and geometry to bacterial flagella, and are capable of 3D navigation in fluids under low‐strength rotating magnetic...
In vivo imaging and actuation of a swarm of magnetic helical microswimmers by external magnetic fields (less than 10 mT) in deep tissue is demonstrated for the first time. This constitutes a major milestone in the field, yielding a generation of micrometer‐scale transporters with numerous applications in biomedicine including synthetic biology, assisted fertilization, and drug/gene delivery.
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