Attacking Autoimmunity (IMAGE) University of Pennsylvania School of Medicine Caption Human regulatory T cells viewed using fluorescence microscopy after immunostaining (left). FOXP3 protein stained by anti-FOXP3 antibody within one regulatory T cell (right). Credit Kathryn T. Iacono, University of Pennsylvania School of Medicine; Proceedings of the National Academy of Sciences Usage Restrictions None License Licensed 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.