4162
To investigate the presence of various isoforms of the estrogen receptor ( ER ) in SLE we isolated RNA from mononuclear cells of lupus patients and normal controls .
 ( protein: estrogen receptor, None) , ( protein: ER, None) , ( cell type: 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: estrogen receptor, None) , ( protein: ER, None) , ( cell type: mononuclear cells, None) 