Sami Michishita in lab (IMAGE) University of California - Santa Cruz Caption Microplastics recovered from the digestive tracts of 23% of the common murres exhibited estrogenic activity in laboratory tests. Here, UCSC graduate student Sami Michishita prepares microplastics for testing. Credit Photo by Liesbeth Van Hassel Usage Restrictions For use only with news coverage of this research 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.