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In this paper we describe results using mRNA differential display reverse transcriptase PCR ( DDPCR ) to identify and isolate short cDNA sequence tags from thymocyte and prostate cells under various hormone conditions .
 ( cell type: prostate cells, None) , ( protein: reverse transcriptase, None) , ( cell type: thymocyte, None) , ( RNA: mRNA, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: prostate cells, None) , ( protein: reverse transcriptase, None) , ( cell type: thymocyte, None) , ( RNA: mRNA, None) 