ICE expression in lymphocytes after cocultivation with CH11. Western blot of CH11-treated (Fas triggering MoAb) (1), ZB4-treated (Fas blocking MoAb) (2), CH11/PHA-treated (3), and untreated (4) subjects shows two bands at 10 and 20 kD MW. The higher MW band at 36 to 38 kD probably represents a nonspecific band that has been reported by the manufacturer (Kamyia).