10011
When studying the binding of SR 31747A on membranes from yeast expressing SR-BP , we found a pharmacological profile of sigma 1 receptors ; binding was displaced by (+)-pentazocine , haloperidol , and (+)-SKF 10,047 , with (+)-SKF 10, 047 being a more potent competitor than (-)-SKF 10,047 .
 ( protein: SR-BP, None) , ( protein: sigma 1 receptors, 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: SR-BP, None) , ( protein: sigma 1 receptors, None) 