Nucleobase Adenine (IMAGE) University of Vienna Caption The drug Pt103 preferably attacks to the nucleobase adenine, one of the building blocks of DNA. Credit Copyright: Juan J. Nogueira, University of Vienna Usage Restrictions The image may only be used with appropriate caption or credit. 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.