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Recent reports demonstrated that ionizing radiation in the dose range of 2-50 Gy results in expression of NF-kappa B in human KG-1 myeloid leukemia cells and human B-lymphocyte precursor cells ; the precise mechanism involved and the significance are not yet known.
 ( cell type: human B-lymphocyte precursor cells, None) , ( protein: NF-kappa B, None) , ( cell line: human KG-1 myeloid leukemia 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:
 ( cell type: human B-lymphocyte precursor cells, None) , ( protein: NF-kappa B, None) , ( cell line: human KG-1 myeloid leukemia cells, None) 