Simulation of PF4 and vaccine interaction (IMAGE) Arizona State University Caption This computer simulation shows a cloud of platelet factor 4 proteins interacting with the electrostatic surface of the Oxford vaccine. Credit Chun Kit Chan, Arizona State University Usage Restrictions No restrictions. License Public Domain 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.