12091
Its activity is essential for the generation of B cell but not of T cell precursors , although the differentiation of the latter is not normal.
 ( cell type: T cell precursors, None) , ( cell type: B cell, 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: T cell precursors, None) , ( cell type: B cell, None) 