13023
Results from Northern blot and flow cytometric analyses , as well as the use of a selective antagonist indicated that PGE2 modulation of HIV-1 LTR -driven reporter gene activity in studied T lymphoid cells is transduced via the EP4 receptor subtype .
 ( DNA: HIV-1 LTR, None) , ( protein: EP4 receptor subtype, None) , ( DNA: reporter gene, None) , ( cell type: T lymphoid 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:
 ( DNA: HIV-1 LTR, None) , ( protein: EP4 receptor subtype, None) , ( DNA: reporter gene, None) , ( cell type: T lymphoid cells, None) 