Figure 2 (IMAGE) Institute for Basic Science Caption A) Lineage graph from real organisms. B) Examples of unicellular, cyclic, chain, tree, and directed acyclic lineage graphs generated from the mathematical model. Credit Institute for Basic Science Usage Restrictions Attribution Required 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.