Molecular Model of Lignin (IMAGE) DOE/Oak Ridge National Laboratory Caption New molecular models of lignin aggregates are helping scientists understand a limiting factor in the production of ethanol. Credit Image courtesy of http://www.scistyle.com 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.