Mitochondrial Acquisition Occurred in a Scenario of Increasing Complexity (image) Institute for Research in Biomedicine (IRB Barcelona) Share Print E-Mail Caption Timeline of early eukaryotic evolution unveiled the mitochondrial acquisition occurred in a scenario of increasing complexity. Credit Utrecht University, IRB Barcelona. Usage Restrictions Attribution-noncommercial-no derivatives Share Print E-Mail 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.