These microbots are constructed in the shape of a small hollow cylinder and made of a resin called SU-8, which the researchers then fill out with a hydrogel-forming mixture. When placed in a liquid reaction mixture, the microbots activate to form elongated thread-like hydrogel tails and propel forward. By making the microbots magnetic, the researchers can accurately control where they move and which cells are entrapped. Owing to their high degree of biocompatibility, these hydrogel microbots will usher a new area of exploration in stem cell therapy and regenerative medicine.
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