10919
Histamine modulates the expression of c-fos through cyclic AMP production via the H2 receptor in the human promonocytic cell line U937 .
 ( protein: H2 receptor, None) , ( cell line: human promonocytic cell line U937, None) , ( DNA: c-fos, 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: H2 receptor, None) , ( cell line: human promonocytic cell line U937, None) , ( DNA: c-fos, None) 