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Using the viral mimic polyinosinic : polycytidylic acid and the IFN alpha / beta antagonist B18R we furthermore demonstrate the capability of endogenous IFN to promote IL - 22 - induced STAT1 activation and expression of CXCL10 .
 polyinosinic : polycytidylic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 polyinosinic : polycytidylic acid