Fluorescent E. coli (video) University of Cambridge Loading video... Caption Fluorescent E. coli turn green as they produce indole. Credit Copyright Avelino Javer and Pietro Cicuta, Cavendish laboratory, University of Cambridge. Usage Restrictions Video use must be associated with full credit info. 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.