1704
The extent of IFN -induced NK cell killing of E1A -expressing cells was proportional to the level of E1A expression and correlated with the ability of E1A to block IFN -stimulated gene expression in target cells .
 protein: IFN; protein: E1A; protein: IFN; cell line: E1A -expressing cells; cell type: target cells; protein: E1A; protein: E1A
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; protein: E1A; protein: IFN; cell line: E1A -expressing cells; cell type: target cells; protein: E1A; protein: E1A