A Library of Poop (2 of 2) (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption To develop a microbial reference library, the Berkeley Lab researchers collected poop from a wide variety of animals, as well as septic tanks and sewer plants. Credit Berkeley Lab 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.