Phylogenetic Tree Diagrams (IMAGE) Tokyo Institute of Technology Caption Phylogenetic tree diagrams form the basis of understanding microbial evolution. Long branches between the two domains in some trees may reflect a period of very rapid evolution, billions of years ago. Credit S. Shiobara, S. McGlynn, ELSI, CC BY 4.0 Usage Restrictions The image may only be used with appropriate caption and credit. 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.