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DR-nm23 mRNA is preferentially expressed at early stages of myeloid differentiation of highly purified CD34+ cells .
 DR-nm23 mRNA, highly purified CD34+ cells, DR-nm23
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DR-nm23 mRNA, highly purified CD34+ cells, DR-nm23