Fertilization Discovery: Do Sperm Wield Tiny Harpoons? (1 of 2) (image) University of Virginia Health System Share Print E-Mail Caption The SLLP1 filament viewed along its cross section. Credit Heping Zheng, Ph.D., University of Virginia School of Medicine Usage Restrictions May be used for reporting on UVA's filament discovery. 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.