Match the mechanism of tolerance breakdown with the functional defect that could directly cause that tolerance breakdown to increase risk of autoimmunity. reversal of anergy in T cells ?[ ??????? ] FoxP3 gene defect AIRE gene defect high levels of IL-2 CTLA-4 gene defect Unregulated T cell proliferation Loss of Treg function [ ??????? ] Significantly reduced negative selection [ ??????? ] <