3905
Culture supernatants from uninduced U937 cells were also found to activate an ISRE cloned upstream of the luciferase reporter gene , indicating the presence of endogenous IFN activity equivalent to approximately 0.3 to 0.5 IU/mL.
 protein: endogenous IFN; cell line: uninduced U937 cells; DNA: ISRE; protein: luciferase; DNA: luciferase reporter gene
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: endogenous IFN, uninduced U937 cells, ISRE, luciferase, luciferase reporter gene 
Answer:
 protein: endogenous IFN; cell line: uninduced U937 cells; DNA: ISRE; protein: luciferase; DNA: luciferase reporter gene