4984
Control of proapoptotic proteins under normal cell conditions of nonapoptotic cells is incompletely understood , but in general , Bax or Bak are activated by the activation of BH3 - only proteins , part of the Bcl-2 family .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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