Bacteria in Gnotobiotic Mouse Colon (image) Marine Biological Laboratory Share Print E-Mail Caption Bacteria in a model human gut microbiome established in a germ-free mouse. Each bacterial species is lit up with a different colored probe, creating a map of the community's spatial organization. Credit Jessica Mark Welch and Yuko Hasegawa, MBL Usage Restrictions Please use with proper credit. Share Print E-Mail 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.