(IMAGE) Goethe University Frankfurt Caption The T4A pili of different Acinetobacter strains have evolutionarily modified the ComC protein at their tip (oval, in different colors) to settle in different niches within humans. Gray bars: cell envelope. Credit Katharina Pfefferle, Goethe University Frankfurt Usage Restrictions To be used only when reporting on Goethe University Frankfurt, Germany. Indicate copyright as: Graphics: Katharina Pfefferle, Goethe University Frankfurt License Original 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.