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We focused our studies on the role of Pit-1 and of PR as potential transcriptional regulators , since the POU domain protein Pit-1 is essential in the control of pituitary PRL expression , and progesterone induces decidual transformation of the endometrial stroma , a differentiation process during which the decidual PRL gene is activated.
 DNA: PRL gene; protein: transcriptional regulators; protein: PR; protein: Pit-1; protein: POU domain protein; DNA: Pit-1; protein: PRL
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: PRL gene, transcriptional regulators, PR, Pit-1, POU domain protein, Pit-1, PRL 
Answer:
 DNA: PRL gene; protein: transcriptional regulators; protein: PR; protein: Pit-1; protein: POU domain protein; DNA: Pit-1; protein: PRL