1894
In a mobility shift assay , only the NF-kappa B ( p50 /p50 ) homodimer was observed in a complex formed with the kappa B sequence in unstimulated SP-B21 cells.
 ( protein: NF-kappa B, None) , ( protein: p50, None) , ( DNA: kappa B sequence, None) , ( protein: NF-kappa B ( p50 /p50 ) homodimer, None) , ( protein: /p50, 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: NF-kappa B, None) , ( protein: p50, None) , ( DNA: kappa B sequence, None) , ( protein: NF-kappa B ( p50 /p50 ) homodimer, None) , ( protein: /p50, None) 