20240729_Zimmermann_nature.jpg (IMAGE) European Molecular Biology Laboratory Caption A science illustrator depicts how the carcinogen BBN (left) is affected by gut bacteria and then metabolised to BCPN (right) and distributed in the body, leading to bladder cancer. Credit: Isabel Romero Calvo/EMBL Credit Isabel Romero Calvo/EMBL Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. Adaptations must be shared under the same terms. License CC BY-NC-SA 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.