Bacteria in the Gut of Fruit Flies (IMAGE) Instituto Gulbenkian de Ciencia Caption This is a microscopic image of beneficial bacteria associated with fruit flies' anterior gut. The nuclei of fly's cells are stained in blue and bacteria are stained in red. Credit Inês Pais and Rita Valente Usage Restrictions This image can only be used to illustrate this news item. 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.