Intron endonuclease (IMAGE) University of California - San Diego Caption An illustration of the intron endonuclease cutting the DNA of a competing virus and disrupting its reproduction. Credit Pogliano Labs, UC San Diego Usage Restrictions Must be used in conjunction with Science paper on phages and selfish genetic elements. License Original 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.