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The nuclear activity of NF-kappa B is tightly regulated from the cytoplasmic compartment by an inhibitory subunit called I kappa B alpha .
 ( protein: inhibitory subunit, None) , ( protein: NF-kappa B, None) , ( protein: I kappa B alpha, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: inhibitory subunit, None) , ( protein: NF-kappa B, None) , ( protein: I kappa B alpha, None) 