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To understand the mechanism by which PRL regulates the biphasic expression of IRF-1 , we cloned the rat IRF-1 gene and functionally characterized the IRF-1 promoter .
 IRF-1 promoter, IRF-1, rat IRF-1 gene, IRF-1, IRF-1, PRL
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 IRF-1 promoter, IRF-1, rat IRF-1 gene, IRF-1, IRF-1, PRL