The zebrafish also has a SHROOM4 gene. (IMAGE) University of Bonn Caption The blue staining reveals that it is formed mainly in the head and brain, the heart, the gastrointestinal tract and the fins. Credit Photo: Dr. Kolvenbach & Dr. Dworschak / University of Bonn Usage Restrictions This image may be used together 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.