Biology - Bacterial Shield Breakdown (IMAGE) DOE/Oak Ridge National Laboratory Caption ORNL assisted in investigating proteins called porins, one shown in red, which are found in the protective outer membrane of certain disease-causing bacteria and tether the membrane to the cell wall. Credit Hyea (Sunny) Hwang/Georgia Tech and ORNL, U.S. Dept. of Energy 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.