4160
Presence of a variant form of the estrogen receptor in peripheral blood mononuclear cells from normal individuals and lupus patients .
 ( cell type: peripheral blood mononuclear cells, None) , ( protein: estrogen receptor, 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: peripheral blood mononuclear cells, None) , ( protein: estrogen receptor, None) 