Turkey Tails (image) Bielefeld University Caption Turkey tails are fungi growing on dead wood such as fallen trees. They contain enzymes that can break down estrogen. However, the Bielefeld students are using a synthetic variant in their research. Credit iGEM-Team Bielefeld-Germany Usage Restrictions The image may only be used with appropriate caption or credit. 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.