Illustration (IMAGE) University of Bonn Caption Zebrafish and humans both have a GPR17 receptor. In the study, the fish receptor was replaced by its human counterpart. This makes it more likely to find pharmacologically active substances. Credit © AG Kostenis-Gomeza / University of Bonn Usage Restrictions Please use this picture only in connection with the press 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.