5903
Retinoic acid can directly modulate gene expression via binding to its nuclear receptors , which can, in turn, activate transcription of target genes .
 ( DNA: target genes, None) , ( protein: nuclear receptors, 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: target genes, None) , ( protein: nuclear receptors, None) 