Schumacher Tularemia (IMAGE) Duke University Caption The three-dimensional structure of a protein called the stringent starvation protein A, a member of a multi-protein complex that Francisella tularensis uses to infect macrophage cells. Credit Maria Schumacher Lab, Duke Biochemistry 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.