Shape-Shifter (IMAGE) University of Chicago Caption This image depicts the shape-shifting capabilities of the anti-HIV drug KP1212. The drug can alter its molecular structure to resemble natural DNA bases, allowing it to penetrate the virus's immunological defenses without detection. The colors represent blue for nitrogen atoms, red for oxygen atoms, white for carbon atoms, and silver for hydrogen atoms. Credit Sam Peng Usage Restrictions News organizations may use this image in connection with reports about the research of Andrei Tokmakoff and his associates. 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.