1056
These results suggest that cdc2 mRNA expression is related to the cell cycling of normal human hematopoietic cells and that E2F plays some roles in the regulation of its expression.
 ( cell type: hematopoietic cells, None) , ( RNA: cdc2 mRNA, None) , ( protein: E2F, None) , ( cell type: normal human hematopoietic 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: hematopoietic cells, None) , ( RNA: cdc2 mRNA, None) , ( protein: E2F, None) , ( cell type: normal human hematopoietic cells, None) 