The intestinal epithelium in the human gut-on-a-chip, when left untreated, protrudes normal villi-like protrusions (on the left), that break down when the chip is exposed to 8 Gy of radiation (middle), and are protected against radiation damage by DMOG (on the right). Credit: Wyss Institute at Harvard University. Credit: Wyss Institute at Harvard UniversityChernobyl. Three Mile Island. Fukushima.