Activation of ATM associates with CD40L/IL-4 responses. (A) Western blots showing the effects of CD40L/IL-4 culture and XR (5 Gy) on levels of ph-ATM, ph-p53, and ph-CHK2. GAPDH is the loading control. Patient ID is given above (labeled 37 to 47) the autorads. Those samples that received XR are indicated.