Filtered (image) Johns Hopkins Medicine Share Print E-Mail Caption Sinuses of mice that inhaled filtered air. The sinus surface is an intact barrier as seen by the presence of proteins that hold the cells together such as E-cadherin (red). Credit Ramanathan lab Usage Restrictions None Share Print E-Mail 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.