Ben-Hall-Mixed- Sorghum-Tubes (IMAGE) University of Wisconsin-Madison Caption Bacteria grown on a solution of sorghum lignin secrete products like PDC into the surrounding media, which must be separated from the cells (right), which contain carotenoids, yielding two valuable products. Credit Chelsea Mamott / University of Wisconsin–Madison Usage Restrictions For editorial use with attribution License Original 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.