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Because these are the characteristics of a signal transducer and activator of transcription (Stat) protein , we determined whether antibodies to Stat proteins will interfere with gel mobility shift and found that antibodies to IL-4 Stat , also known as Stat6 , but not antibodies to other Stat proteins , interfere with the formation of the IL-4 NAF complex .
 IL-4, Stat6, Stat proteins, antibodies to Stat proteins, IL-4 Stat, antibodies, IL-4, antibodies to IL-4 Stat, IL-4 NAF complex, signal transducer and activator of transcription (Stat) protein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 IL-4, Stat6, Stat proteins, antibodies to Stat proteins, IL-4 Stat, antibodies, IL-4, antibodies to IL-4 Stat, IL-4 NAF complex, signal transducer and activator of transcription (Stat) protein