‘Neurobots’ built from frog cells
Researchers described so‑called 'neurobots'—living constructs grown from frog cells that self‑organize nervous tissue and survived about ten days in lab experiments reported in Advanced Science and picked up widely on social channels. (x.com)
These “neurobots” are tiny living balls of frog embryo cells that grew simple nerve networks and moved differently from earlier cell-made bots. (tufts.edu) The work came from Tufts University and the Wyss Institute at Harvard University, led by Michael Levin and Haleh Fotowat, and was reported in March 2026 in *Advanced Science*. (wyss.harvard.edu) The starting point is a xenobot, a tiny structure made from early cells of the African clawed frog, *Xenopus laevis*. When skin precursor cells are removed from the embryo and left in a dish, they can form spheres covered in cilia, the hairlike structures that beat in sync and push the bots through water. (eurekalert.org) Earlier xenobots had no nervous system. In the new experiments, the team implanted clusters of frog neural precursor cells into the center of the forming bots, and those cells matured into neurons with axons and dendrites spreading through the interior and toward surface cells. (tufts.edu) The researchers reported that these neuron-bearing bots developed self-organized neural circuits, changed shape, and showed movement patterns that differed from non-neuronal biobots. The Wyss Institute said the neurobots also showed distinct gene-expression profiles compared with standard biobots and sham controls. (wyss.harvard.edu) That makes the study a test of a basic biology question: what cells do when they are freed from their usual embryo and allowed to assemble a new body plan. Levin said the team wanted to see what a nervous system would look like in a novel living form that had not been shaped by evolution for that role. (tufts.edu) The group’s earlier xenobot work dates to 2020, when Tufts and University of Vermont researchers reported frog-cell constructs that could move, self-heal, and in some cases gather loose cells into copies of themselves. This new version adds neurons to that line of experiments rather than using metal, plastic, or electronic parts. (eurekalert.org) The bots are short-lived. Tufts said the constructs survive about 9 to 10 days on nutrients already stored in the original embryonic cells, and the team said they were made without genetic modification or synthetic scaffolds. (tufts.edu) Researchers and outside coverage have pointed to regenerative medicine as one long-term use case, because cell collectives that self-organize could help scientists learn how to rebuild or repair tissue. The Wyss Institute said related biobots made from human cells, called anthrobots, have already been studied for healing neural wounds in laboratory dishes. (wyss.harvard.edu) For now, the neurobots are lab constructs, not animals released into the wild or devices used in patients. The immediate result is simpler: frog cells given a new arrangement built a rudimentary nervous system on their own and behaved like something different from the embryo they came from. (eurekalert.org)
