DA1 Enhancement (IMAGE) Max Planck Institute for Chemical Ecology Caption In virgin Drosophila flies vinegar odor intensifies the effect of a male sex pheromone. Activation of the glomerulus DA1 is enhanced, the females become more receptive towards courting males. Credit Silke Sachse / Max Planck Institute for Chemical Ecology 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.