【单选题】In vertebrates, caspase ware the initiator and effector molecules (enzymes) of apoptosis; and
A.
death signal the Fas ligands bind to their Fas receptors, leading to dimerization and activation of the death receptor, which initiate the “cell Murder” apoptosis
B.
the effector “destruction” caspases are activated by dimerization with each of the subunit to stabilizing the active sit of the other
C.
“destruction” caspases can cleave one and another including the initiator caspases
D.
caspase8 and caspase9 are the initiator “killer” protein respectively in the immune system and in the others