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In human histiocytic U937 cells mRNA of clone pAT 133 was constitutively expressed, whereas mRNA of pAT 225/EGR1 was induced upon induction of terminal differentiation .
 cell line: human histiocytic U937 cells; RNA: mRNA; RNA: human histiocytic U937 cells mRNA; protein: pAT 225/EGR1
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 cell line: human histiocytic U937 cells; RNA: mRNA; RNA: human histiocytic U937 cells mRNA; protein: pAT 225/EGR1