14731
These studies indicate that heterologous enhancer elements are capable of restoring Tat responsiveness to the HIV LTR in the context of directing reporter gene expression as well as in the production of infectious progeny virions .
 ( DNA: HIV LTR, None) , ( DNA: heterologous enhancer elements, None) , ( protein: Tat, None) , ( DNA: reporter gene, 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 LTR, None) , ( DNA: heterologous enhancer elements, None) , ( protein: Tat, None) , ( DNA: reporter gene, None) 