The adult midgut of the Drosophila fly (IMAGE) Universität Leipzig Caption The adult midgut of the Drosophila fly: The preparation is visible under the microscope due to nuclear staining and endogenous expression of the receptor Mayo. Credit Photo: Dr. Beatriz Blanco-Redondo Usage Restrictions No 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.