6859
Together, these results indicate that UV -induced CYP1A1 gene expression in mammalian cells is mediated by an Ah receptor ligand formed from tryptophan .
 ( protein: Ah receptor, None) , ( cell type: mammalian cells, None) , ( protein: CYP1A1, 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: Ah receptor, None) , ( cell type: mammalian cells, None) , ( protein: CYP1A1, None) 