FruitFlies (IMAGE) Michigan Medicine - University of Michigan Caption These are fruit flies in the Pletcher lab at U-M. The female's pheromones will have significant effects on the male's lifespan and health. Credit U-M Health System Usage Restrictions None 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.