Cas12a2 Unzips DNA Double Helix (IMAGE) University of Texas at Austin Caption In this illustration based on cryo-electron microscope images, a Cas12a2 protein unzips a DNA double helix, allowing it to cut the single strands of DNA (blue and green). Credit Jack Bravo/University of Texas at Austin Usage Restrictions None 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.