Random Tree Structures (IMAGE) California Institute of Technology Caption Colored atomic force microscope image of self-assembled random tree structures on the surface of DNA tile arrays. Each tree has a single loop as the "root." Credit Caltech / Grigory Tikhomirov, Philip Petersen and Lulu Qian. Usage Restrictions WITH IMAGE CREDITS 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.