Spanning Tree (IMAGE) Arizona State University Caption The boldfaced line, known as a spanning tree, follows the desired geometric shape, touching each vertex just once. A spanning tree algorithm is used in the new DNA origami method to map out the proper routing path for the DNA strand. Credit Public Domain 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.