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In the present study using specific antibodies , we analyzed the expression of the RXR alpha protein in blood mononuclear cells from acute myeloid patients ( AML ) (10 cases) and from myelomonocytic cell lines arrested at different stages of differentiation.
 ( protein: specific antibodies, None) , ( protein: RXR alpha protein, None) , ( cell line: myelomonocytic cell lines, None) , ( cell type: blood mononuclear 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:
 ( protein: specific antibodies, None) , ( protein: RXR alpha protein, None) , ( cell line: myelomonocytic cell lines, None) , ( cell type: blood mononuclear cells, None) 