13801
Flow cytometry revealed that primary leukemia cells from a patient with CD8+ T-PLL expressed IL-2R alpha and beta chains , and the cells showed a proliferative response and an increase in IL-2Ralpha expression on culture with exogeneous IL-2 .
 IL-2Ralpha, IL-2, primary leukemia 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:
 IL-2Ralpha, IL-2, primary leukemia cells