622
Alanine substitutions introduced at two serine residues positioned within this N-terminal regulatory region of I kappa B alpha also yielded constitutive repressors that escaped from Tax -induced turnover and that potently inhibited immune activation pathways for NF-kappa B induction , including those initiated from antigen and cytokine receptors .
 ( protein: Tax, None) , ( protein: I kappa B alpha, None) , ( protein: N-terminal regulatory region, None) , ( protein: NF-kappa B, 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: Tax, None) , ( protein: I kappa B alpha, None) , ( protein: N-terminal regulatory region, None) , ( protein: NF-kappa B, None) 