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.
 CD4+ T-cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 CD4+ T-cells