Core and Flexiible Microbiota (IMAGE) University of California - Berkeley Caption As this schematic illustrates, we all have microbes in our guts: our microbiota. Michael Shapira proposes that not all microbes are the same. Some, core microbes, are important for our existence and evolution, and may even be passed down to our offspring. In addition, a flexible pool of microbes -- members of which can be exchanged with similar microbes in the environment -- is available to assist our survival and adaptation in the face of environmental changes. Credit Michael Shapira/UC Berkeley 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.