9505
Through this mechanism of gene regulation , YY1 and LSF could contribute to the establishment and maintenance of a population of cells stably but nonproductively infected with HIV-1 .
 ( protein: YY1, None) , ( protein: LSF, 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: YY1, None) , ( protein: LSF, None) 