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To define the mechanism underlying signal transducer and activator of transcription (STAT) protein recruitment to the interleukin 10 ( IL-10 ) receptor , the STAT proteins activated by IL-10 in different cell populations were first defined using electrophoretic mobility shift assays .
 signal transducer and activator of transcription (STAT) protein, IL-10, interleukin 10, interleukin 10 ( IL-10 ) receptor, IL-10, STAT proteins
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:
 signal transducer and activator of transcription (STAT) protein, IL-10, interleukin 10, interleukin 10 ( IL-10 ) receptor, IL-10, STAT proteins