<i>Bacillus subtilis</i> (IMAGE) Trinity College Dublin Caption Colonies of Bacillus subtilis, the focal species of bacteria in the study, growing on an agar plate. This bacterium is found in a variety of environments, from soil to the human gut. Credit Deirdre McClean 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.