Flies with Blue Bellies (IMAGE) Instituto Gulbenkian de Ciencia Caption Flies get blue bellies after ingestion of the yeast-enriched food colored with a blue dye. Credit Carlos Ribeiro, group leader in the Champalimaud Neuroscience Programme at the Instituto Gulbenkian de Ciência (Portugal) Usage Restrictions High-resolutions images available upon request. License Licensed 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.