10873
However, for the clonal expansion of CD4+ T-cells , which is a characteristic result of HTLV-I infection , activation of the CREB/ATF and SRF pathways is also required.
 ( cell type: CD4+ T-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: CD4+ T-cells, None) 