A Busy Cell Surface (image) Kyoto University Caption The phospholipid bilayer is composed of many different lipids. Flipping certain ones from the outer to inner layer (and vice versa) allows the cell to change dynamics and interact with the environment. Credit Kyoto University / Tomoki Shimizu / Shin Lab Usage Restrictions None 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.