1603
SFs blocked the sustained activity of transcription factor Stat1 , but not Stat3 , during the priming period, and Stat1 activity was differentially regulated by cytokines in parallel with their positive or negative regulation of IFN-gamma production .
 protein: Stat1; protein: Stat3; protein: cytokines; protein: IFN-gamma; protein: transcription factor Stat1; cell type: SFs
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: Stat1; protein: Stat3; protein: cytokines; protein: IFN-gamma; protein: transcription factor Stat1; cell type: SFs