8013
These results support the hypothesis that soluble factors released by rat lymphocytes modulate the immune response of the mother and participate in the mechanism that protects the fetus against antipaternal antibodies .
 ( protein: soluble factors, None) , ( cell type: rat lymphocytes, None) , ( protein: antipaternal antibodies, 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: soluble factors, None) , ( cell type: rat lymphocytes, None) , ( protein: antipaternal antibodies, None) 