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To understand the role of NF-kappa B complexes in T cell development and activation , we have generated transgenic mice in which RelA and c-Rel complexes were selectively inhibited in the T-lineage cells by specific expression of a trans-dominant form of I kappa B alpha .
 ( protein: I kappa B alpha, None) , ( protein: NF-kappa B, None) , ( protein: c-Rel complexes, None) , ( protein: RelA, None) , ( cell type: T-lineage cells, 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: I kappa B alpha, None) , ( protein: NF-kappa B, None) , ( protein: c-Rel complexes, None) , ( protein: RelA, None) , ( cell type: T-lineage cells, None) 