Ovastacin (IMAGE) Rockefeller University Press Caption A study in the Journal of Cell Biology describes how ovastacin helps egg cells avoid being fertilized by more than one sperm. In this image, ovastacin (red) localizes to secretory granules (green) in the cortex of an unfertilized egg. Credit Burkart, A.D., et al. 2012. J. Cell Biol. <A HREF="http://dx.doi.org/10.1083/jcb.201112094">http://dx.doi.org/10.1083/jcb.201112094</A>. Usage Restrictions Reporters may freely use these materials in news coverage, with the appropriate credit information. 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.