Membrane Permeability Simulation (IMAGE) Biophysical Society Caption In a composite of two images, cyan-colored drug molecules are shown passing through a cell membrane. Credit T. Carpenter/LLNL Usage Restrictions This image may be used only with appropriate caption and credit. 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.