Yersinia Infecting Macrophages (image) University of Washington Caption Yersinia (gray) infects two macrophages. In the upper right pyroptosis was subverted via YopM, in the bottom left, pyroptosis is induced and an inflammasome is formed (white). Credit Brad Cookson lab 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.