Two distinct groups of Tregs (IMAGE) La Jolla Institute for Immunology Caption In their proposed model of a Listeria infection, the LJI researchers show how two distinct groups of Tregs (bottom row) play different roles at different points in the infection. Credit Published in Dolina et al., PNAS, and used with permission. Usage Restrictions Published in Dolina et al., PNAS, and used with permission. 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.