A new study by scientists at UNC Lineberger Comprehensive Cancer Center and colleagues published Oct. 30, 2020, in Science, showed that mice exposed to potentially lethal levels of total body radiation were protected from radiation damage if they had specific types of bacteria in their gut. Radiation absorbed in a clinical setting or during an accidental exposure can cause damage to tissues. In this study, the bacteria mitigated radiation exposure and enhanced the recovery of blood cell production as well as repair of the gastrointestinal (GI) tract.