Bacteroides -B&W (IMAGE) Howard Hughes Medical Institute Caption Different Bacteroides species (five shown) colonize human intestines, along with many other species of bacteria. These microbes, known collectively as the gut microbiome, play a key role in people's health. Credit Kevin Cutler/Mougous Lab/UW/HHMI Usage Restrictions Must use credit 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.