7117
Ninety-seven percent of gamma/delta TCR+ pregnancy lymphocytes expressed progesterone receptor .
 ( protein: progesterone receptor, None) , ( cell type: gamma/delta TCR+ pregnancy lymphocytes, 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: progesterone receptor, None) , ( cell type: gamma/delta TCR+ pregnancy lymphocytes, None) 