Lignin (IMAGE) DOE/Pacific Northwest National Laboratory Caption Woody lignin, seen here in purified form, holds significant promise as a renewable biofuel, if it can be efficiently broken down into useful form. Credit (Photo by Andrea Starr | Pacific Northwest National Laboratory) Usage Restrictions No restrictions. License Public Domain 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.