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Analysis of whole-cell lysates by antiphosphotyrosine immunoblotting showed that incubation with gamma interferon brought about specific increases in phosphotyrosine labeling of several proteins.
 protein: gamma interferon
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: gamma interferon