Blood-slide-mcmaster (IMAGE) McMaster University Caption Blood slips off the repellent surface at left, but clings to an untreated surface at right. Credit Kevin Patrick Robbins, McMaster University 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.