13804
IL-2 binding analysis demonstrated that IL-2 markedly increased the number of low affinity IL-2Rs on the leukemia cells , without an effect on the number of high-affinity IL-2Rs .
 ( protein: IL-2, None) , ( protein: IL-2, None) , ( cell type: leukemia cells, None) , ( protein: IL-2Rs, None) , ( protein: high-affinity IL-2Rs, 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:
 ( protein: IL-2, None) , ( protein: IL-2, None) , ( cell type: leukemia cells, None) , ( protein: IL-2Rs, None) , ( protein: high-affinity IL-2Rs, None) 