<em>E. coli</em> Transporter (IMAGE) New York University Caption Schematic showing the two protein subunits (blue and green) of a simple transporter in E. coli changing the direction of its opening so it can pump a toxic compound (orange) across the cell's membrane (grey). Credit Nathaniel Traaseth and Ampon Sae Her (CC BY 4.0) 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.