Moreover, higher percentages of cells expressing CD95 in AT patients (median: 44% vs. 84%) and TIGIT (median: 49% vs. 73%) were observed, indicating that, like in the conventional naive T cells, there was a relative skewing towards cells that had encountered antigen within the Tregs (Figures 3C, E, H) (24). Here, FAS is linked to ataxia telangiectasia.