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Activation of the dPRL promoter construct in these undifferentiated cells could however be induced by the addition of cAMP , in the absence of progesterone , suggesting that a signal transduced through the cAMP signaling pathway is a primary inducer of decidual PRL gene expression .
 dPRL promoter, PRL gene
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:
 dPRL promoter, PRL gene