Halo Therapeutics Ltd (IMAGE) University of Bristol Caption Without the spike protein, COVID-19 would be unable to enter human cells Credit University of Bristol Usage Restrictions The image is for single use only, should be credited and should not be archived 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.