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Using site - directed mutagenesis , we show that the RAREoct contributes to the transcriptional activation of Oct - 3 / 4 promoter in P19 cells and , most interestingly , mediates the RA - induced repression in RA - differentiated EC cells .
 RAREoct, Oct - 3 / 4 promoter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 RAREoct, Oct - 3 / 4 promoter