T-maze (IMAGE) ETH Zurich Caption Behavioral experiment with bacteria: a T-maze with a chemical gradient presents bacterial cells with the choice of approaching or avoiding the attractant at each branching. Credit ETH Zurich 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.