Drug Resistance in TB (IMAGE) Iowa State University Caption This ribbon diagram shows the crystal structure of the Rv3066 regulator that controls the expression of a pump that removes toxins from tuberculosis bacteria. Credit Edward Yu/Iowa State University 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.