Doug Guzior (IMAGE) Michigan State University Caption Michigan State University doctoral student Doug Guzior. . Working in the lab of Robert Quinn, Guzior’s latest paper reports the discovery of the enzyme responsible for producing microbially conjugated bile acids. Credit Courtesy Doug Guzior Usage Restrictions No restrictions 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.