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We developed unicellular culture systems for unilineage differentiation of purified hematopoietic progenitor cells followed by daughter cell analysis at cellular and molecular level.
 ( cell type: purified hematopoietic progenitor cells, None) , ( cell type: progenitor cells, 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: purified hematopoietic progenitor cells, None) , ( cell type: progenitor cells, None) 