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Interferon-gamma potentiates the antiviral activity and the expression of interferon-stimulated genes induced by interferon-alpha in U937 cells .
 cell line: interferon-alpha in U937 cells; protein: Interferon-gamma; DNA: interferon-stimulated genes
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: interferon-alpha in U937 cells; protein: Interferon-gamma; DNA: interferon-stimulated genes