867
Pretreatment with IFN-gamma potentiates the IFN-alpha -induced protection , but IFN-gamma alone does not have any antiviral activity .
 protein: IFN-gamma; protein: IFN-gamma; protein: IFN-alpha
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-gamma; protein: IFN-gamma; protein: IFN-alpha