13616
The data show that unstimulated human peripheral B cells express mRNA of the RA receptor alpha , beta , and gamma .
 ( cell type: unstimulated human peripheral B 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:
 ( cell type: unstimulated human peripheral B cells, None) 