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; cell type: mammalian cells; protein: CYP1A1
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: Ah receptor, mammalian cells, CYP1A1 
Answer:
 protein: Ah receptor; cell type: mammalian cells; protein: CYP1A1