Human Instestinal Organoids (IMAGE) Michigan Medicine - University of Michigan Caption These HIO structures, each about the size of a BB and grown from stem cells, allow scientists to study the interaction between the cells of the gut lining and microbes that are either normally present in the gut or invade to cause disease. Credit University of Michigan Medical School 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.