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【单选题】
Akt, also called protein kinase B (PKB), promotes the growth and survival of many cell types, often by inactivating the signaling proteins it phosphorylates. For example, Akt phosphorylates and inactivates a cytosolic protein called _____ which promotes apoptosis.
A.
Bad (Bcl-2-associated agonist of cell death )
B.
Bcl-2
C.
Bax
D.
Bcl-xl
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