GTPases (image) University of Basel Caption GTPases (green) attack Salmonella typhimurium (red). Credit Figure: University of Basel, Biozentrum) Usage Restrictions Give adequate attribution to the original author. 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.