WT and Mutant Lactobacillus johnsonii (image) Norwich BioScience Institutes Caption This is a transmission electron micrograph of normal, wild type (left) and EPS cluster mutant (right) L. johnsonii. The mutant on the right has a much reduced EPS coat. Credit IFR Usage Restrictions None 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.