1155
We have previously found that the normal developmental patterns of globin gene expression are recapitulated in an experimental system of primary cultures that support differentiation of erythroid progenitors .
 ( cell type: erythroid progenitors, None) , ( cell line: primary cultures, None) , ( DNA: globin gene, 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 progenitors, None) , ( cell line: primary cultures, None) , ( DNA: globin gene, None) 