AICD in lymphocytes from Fas-defective patients and healthy controls. TSST-1 AICD (B) was compared with Fas sensitivity (A) of T cells from 6 ALPS-I patients (P1 to P6), from 2 healthy mutation positive relatives (fP1 and fP6), and from eight age-related control donors. Experiments were performed as described in Figure 1 using TSST-1/TSST-1 activation/restimulation. The shaded gray zones indicate means of apoptosis induced by Fas or TSST-1 AICD in control-cells (n = 21; in panel A, mean = 89% ± 2% [SEM]; in panel B, mean = 68% ± 2%).