3620
A switch from human fetal (gamma) -to adult (beta)-globin expression occurs within erythroid precursor cells of the adult lineage .
 ( cell type: erythroid precursor cells, None) , ( cell type: adult lineage, None) , ( protein: adult (beta)-globin, None) , ( protein: human fetal (gamma), 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: erythroid precursor cells, None) , ( cell type: adult lineage, None) , ( protein: adult (beta)-globin, None) , ( protein: human fetal (gamma), None) 