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U937 cells express both type I and type II IFN receptors , but only IFN-alpha is capable of inducing antiviral protection in these cells.
 protein: IFN-alpha; protein: type II IFN receptors; protein: type I; cell line: U937 cells; protein: type I and type II IFN receptors
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: IFN-alpha; protein: type II IFN receptors; protein: type I; cell line: U937 cells; protein: type I and type II IFN receptors