Chlamydia's Shield (IMAGE) Duke University Caption At left: A wild type Chlamydia (green) surrounded by the GarD protein (red) that cloaks it from detection inside human cells. Right: Chlamydia with GarD knocked out (green) are enveloped by the antimicrobial proteins ubiquitin (yellow) and RNF213 (magenta). Credit Stephen C. Walsh, Duke University Usage Restrictions With Credit 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.