KRAS Image (IMAGE) University of North Carolina Health Care Caption Using bioluminescence, researchers showed that the novel molecule 'KRAS silencing RNA' or 'KRAS siRNA' (right) reduced the size of a tumor in mice. Researchers used a 'non-KRAS silencing' molecule as the control (left) as a comparison. Credit Chad Pecot, MD, UNC Lineberger Comprehensive Cancer Center 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.