Figure 3 (IMAGE) Institute for Basic Science Caption Coronaviruses enter cells through membrane fusion between the virus envelope and cell membrane. When cells expressing coronavirus spike protein (green) are cultivated with human lung cells (red), membrane fusion followed by fusion between the two cells can be observed. Lansemaside A inhibits this membrane fusion, thereby confirming that its mechanism is based on blocking membrane fusion. Credit Institute for Basic Science Usage Restrictions Attribution Required License Original 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.