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Immunological studies also failed to demonstrate any significant change except for a significant increase of natural killer ( NK ) cell activity after IFN - gamma infusion .
 GENE: IFN - gamma
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: IFN - gamma