Rhizobia bacteria (IMAGE) Washington State University Caption Rhizobia bacteria residing within a plant’s root nodule tissue. Image captured via scanning electron microscope at a Washington State University. Credit Abigail Eaker, Washington State University Usage Restrictions For use only with stories associated with this press release License Original 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.