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DR-nm23 mRNA is preferentially expressed at early stages of myeloid differentiation of highly purified CD34+ cells .
 ( RNA: DR-nm23 mRNA, None) , ( cell line: highly purified CD34+ cells, None) , ( protein: DR-nm23, 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:
 ( RNA: DR-nm23 mRNA, None) , ( cell line: highly purified CD34+ cells, None) , ( protein: DR-nm23, None) 