Foxp3YFP-Cre (Ref.32 ), Foxp3GFP-Cre-ERT2 (Ref.33 ), Rosa26STOP f/f-YFP (Ref.34 (link)), Rosa26STOP f/f-IKK2ca (Ref.35 (link)), Ifng KO,36 B6-scurfy (Ref.37 (link)) and C57BL/6/J mice were purchased from Jackson laboratories. Ramnik J. Xavier and James J. Moon (MGH) provided CARMA1f/f (Ref.38 (link)) and Rag1 KO mice, respectively. Animals were housed in specific pathogen-free facilities at the Massachusetts General Hospital (MGH) and all experimental studies were approved and performed in accordance with guidelines and regulations implemented by the MGH Institutional Animal Care and Use Committee (IACUC). For survival studies the age of mice at euthanasia mandated by a moribund state of health was recorded in Kaplan Meyer plots.