Backhed and Olsson (IMAGE) University of Gothenburg Caption Fredrik Backhed and Lisa Olsson, Sahlgrenska Academy, University of Gothenburg Credit Photo by Johan Wingborg and Malin Arnesson Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.