Final answer:
Pro-apoptotic BH123 proteins contain the BH domains BH1, BH2, and BH3. These BH domains interact with anti-apoptotic proteins to initiate apoptosis.the BH domains BH1, BH2, and BH3
Step-by-step explanation:
Pro-apoptotic BH123 proteins contain the BH domains BH1, BH2, and BH3. These BH domains play a crucial role in the initiation of apoptosis by interacting with anti-apoptotic proteins, such as Bcl-2, and promoting mitochondrial permeabilization.