Laser Trims Fruit Fly Genital Spines (IMAGE) University of Cincinnati Caption Karl Grieshop uses a precision laser system to trim the claw-like spines of male fruit flies. In a paper published May 3 in the journal Evolution, University of Cincinnati graduate student Karl Grieshop and Michal Polak, associate professor of biological sciences at UC, examine the role of genital spines in the reproductive success of a species of fruit fly. Credit Jay Yocis, University of Cincinnati 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.