9754
We therefore compared the turnover of I kappa B alpha and I kappa B beta in mature B cells and HeLa cells .
 ( protein: I kappa B alpha, None) , ( cell line: HeLa cells, None) , ( cell type: mature B cells, None) , ( protein: I kappa B beta, 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) , ( cell line: HeLa cells, None) , ( cell type: mature B cells, None) , ( protein: I kappa B beta, None) 