Toxin Pump (IMAGE) Iowa State University Caption This ribbon diagram shows the inner membrane transporter (green) and the middle adapter (red and blue) of the CusBA pump. Credit Edward Yu/Iowa State University, Ames Laboratory 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.