Rhizobia (IMAGE) ETH Zurich Caption Rhizobia (in blue) in the roots of a plant. The brown structures are plant proteins (coloured electron microscope image). Credit ETH Zurich / Anne-Greet Bittermann Usage Restrictions Use of the image only in connection with reporting on this research work of ETH Zurich. 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.