Loops and Mazes (IMAGE) California Institute of Technology Caption Self-assembled loop, maze, and tree structures on the surface of DNA tile arrays. Top row, random mazes with three-way and four-way junctions of varying distances between adjacent junctions versus only three-way junctions of a fixed distance between adjacent junctions. Middle row, random trees (each tree has a single loop as the "root") with longer branches of varying lengths versus shorter branches of fixed lengths. Bottom row, random loops with tunable lengths and number of crossings. Credit Courtesy of L. 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.