Chronic Immune Activation in Systemic Lupus Erythematosus and the Autoimmune PTPN22 Trp620 Risk Allele Drive the Expansion of FOXP3+ Regulatory T Cells and PD-1 Expression oleh Ricardo C. Ferreira, Xaquin Castro Dopico, João J. Oliveira, Daniel B. Rainbow, Jennie H. Yang, Dominik Trzupek, Sarah A. Todd, Mhairi McNeill, Maristella Steri, Valeria Orrù, Edoardo Fiorillo, Daniel J. M. Crouch, Marcin L. Pekalski, Francesco Cucca, Francesco Cucca, Tim I. Tree, Tim J. Vyse, Linda S. Wicker, John A. Todd