ACE2, CK18 (IMAGE) Johns Hopkins Medicine Caption Red stain is ACE2. The green probe is staining CK18, which is found in supporting cells and mucus glands. Credit Photo by Mengfei Chen 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.