5156
The mouse mammary tumor virus env gene contains a transcriptional activator ( META ) that can control transcription of the adjacent long terminal repeat region .
 ( DNA: long terminal repeat region, None) , ( DNA: transcriptional activator, None) , ( DNA: env gene, None) , ( DNA: META, 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: long terminal repeat region, None) , ( DNA: transcriptional activator, None) , ( DNA: env gene, None) , ( DNA: META, None) 