7273
In addition, competitive single-cell RT-PCR was used to assay CD34 mRNA transcripts in sibling CD34 (+) CD38(-) cells differentiating in unilineage erythroid cultures : this analysis allowed us to semiquantitate the gradual downmodulation of CD34 mRNA from progenitor cells through their differentiating erythroid progeny .
 ( cell type: progenitor cells, None) , ( RNA: CD34 mRNA, None) , ( cell line: sibling CD34 (+) CD38(-) cells, None) , ( protein: CD34, None) , ( protein: CD34, None) , ( protein: CD34, None) , ( RNA: CD34 mRNA transcripts, None) , ( cell line: unilineage erythroid cultures, None) , ( cell line: differentiating erythroid progeny, 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: progenitor cells, None) , ( RNA: CD34 mRNA, None) , ( cell line: sibling CD34 (+) CD38(-) cells, None) , ( protein: CD34, None) , ( protein: CD34, None) , ( protein: CD34, None) , ( RNA: CD34 mRNA transcripts, None) , ( cell line: unilineage erythroid cultures, None) , ( cell line: differentiating erythroid progeny, None) 