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A clone of U937 cells was selected which expressed Fc receptor I ( Fc gamma RI ) and which, after incubation with IFN-gamma for 72 h, was capable of generating high levels of lucigenin-enhanced CL .
 protein: Fc receptor I; cell line: U937 cells; protein: IFN-gamma; protein: Fc gamma RI
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:
 protein: Fc receptor I; cell line: U937 cells; protein: IFN-gamma; protein: Fc gamma RI