14732
Tyrosine phosphorylation is a mandatory proximal step in radiation-induced activation of the protein kinase C signaling pathway in human B-lymphocyte precursors [published erratum appears in Proc Natl Acad Sci U S A 1993 Apr 15;90(8):3775]
 ( protein: protein kinase C, None) , ( cell type: human B-lymphocyte precursors, 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: protein kinase C, None) , ( cell type: human B-lymphocyte precursors, None) 