7014
The expression of the PML gene was investigated in purified early hematopoietic progenitor cells ( HPCs ) induced to unilineage erythroid or granulocytic differentiation .
 ( DNA: PML gene, None) , ( cell type: hematopoietic progenitor cells, None) , ( cell type: HPCs, 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:
 ( DNA: PML gene, None) , ( cell type: hematopoietic progenitor cells, None) , ( cell type: HPCs, None) 