A sketch of Drosophila fruit flies. (IMAGE) Ecole Polytechnique Fédérale de Lausanne Caption Evolutionary selection can tailor host antimicrobial peptides (chains) to control specific microbiome bacteria. As a defense system common across plants and animals, variations in the repertoire of antimicrobial peptides are likely important as key risk factors for preventing infection by common ecological microbes. Credit Diego Galagovsky. In Hanson et al., DOI: 10.1126/science.adg5725 Usage Restrictions This image falls under the restriction policies of AAAS Science. Please address your reproduction permission requests to the Editorial office. License Original 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.