5485
To confirm the binding of protein to these sites in cells , we carried out an in vivo genomic footprinting analysis of this portion of the TGF alpha promoter in normal and transformed rat liver epithelial cell lines that express the endogenous gene at varying levels .
 TGF alpha promoter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 TGF alpha promoter