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We have used differential hybridization analysis of a cDNA library constructed from the murine RA -inducible MPRO promyelocyte cell line to identify immediate-early genes induced by RA during granulocytic differentiation .
 RA -inducible MPRO promyelocyte cell line, cDNA library, immediate-early genes
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:
 RA -inducible MPRO promyelocyte cell line, cDNA library, immediate-early genes