13279
We have investigated, by the use of the reverse transcription polymerase chain reaction amplification technique , the possible existence of ER variants in other normal oestrogen target organs and cells, such as uterus ( myometrium and endometrium ), in peripheral blood mononuclear cells and in a benign uterus tumour ( leiomyoma ).
 ( protein: ER, None) , ( cell type: peripheral 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: ER, None) , ( cell type: peripheral blood mononuclear cells, None) 