Soil (IMAGE) Rockefeller University Caption In bacterial DNA extracted from soil, researchers discovered a compound related to the antibiotic colistin. Credit Zach Veilleux/The Rockefeller University Usage Restrictions Image may be used to illustrate research described in the accompanying release. 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.