7191
Dexamethasone ( Dex ), a synthetic glucocorticoid hormone , cooperated with Epo and stem cell factor to induce erythroid progenitors to undergo 15 to 22 cell divisions, corresponding to a 10(5)- to 10(6)-fold amplification of erythroid cells .
 ( cell type: erythroid cells, None) , ( protein: Epo, None) , ( protein: stem cell factor, None) , ( cell type: erythroid progenitors, 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 cells, None) , ( protein: Epo, None) , ( protein: stem cell factor, None) , ( cell type: erythroid progenitors, None) 