9667
In mammalian cells , I kappa B alpha and I kappa B beta proteins have been purified and shown to be the inhibitors of NF-kappa B through their association with the p65 or c-Rel subunits .
 ( cell type: mammalian cells, None) , ( protein: I kappa B alpha, None) , ( protein: I kappa B beta, None) , ( protein: NF-kappa B, None) , ( protein: I kappa B beta proteins, 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:
 ( cell type: mammalian cells, None) , ( protein: I kappa B alpha, None) , ( protein: I kappa B beta, None) , ( protein: NF-kappa B, None) , ( protein: I kappa B beta proteins, None) 