Microbiome Changes (IMAGE) University of Pennsylvania Caption Researchers compared the microbiomes of animals at postnatal day 28 using a sequencing approach. Credit Courtesy of the University of Pennsylvania Usage Restrictions In context of reporting 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.