Yin and Yang (IMAGE) University of Basel Caption Two competing signaling molecules control Caulobacter lifestyle. Pink: Swarmer cell with high ppGpp level; blue: sessile form with high c-di-GMP level. Credit University of Basel, Biozentrum Usage Restrictions Only to be used in reporting on research by the University of Basel 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.