754
Human eosinophils are one of the most important target cells for IL-5 and were used here to study IL-5 signaling in a primary human cell .
 ( protein: IL-5, None) , ( cell type: primary human cell, None) , ( cell type: Human eosinophils, None) , ( cell type: target cells, None) , ( protein: IL-5, 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-5, None) , ( cell type: primary human cell, None) , ( cell type: Human eosinophils, None) , ( cell type: target cells, None) , ( protein: IL-5, None) 