Transgenic Fruit Fly (image) University of Chicago Medical Center Share Print E-Mail Caption A transgenic fruit fly engineered to carry the alcohol dehydrogenase gene as it existed about 4 million years ago. Thousands of these 'ancestralized' flies were bred and studied for their ability to metabolize alcohol and to survive on an alcohol-rich food source. Credit Kathleen Gordon Usage Restrictions None Share Print E-Mail 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.