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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 .
 protein: signal transducer and activator of transcription (STAT) protein; protein: IL-10; protein: interleukin 10; protein: interleukin 10 ( IL-10 ) receptor; protein: IL-10; protein: STAT proteins
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: signal transducer and activator of transcription (STAT) protein, IL-10, interleukin 10, interleukin 10 ( IL-10 ) receptor, IL-10, STAT proteins 
Answer:
 protein: signal transducer and activator of transcription (STAT) protein; protein: IL-10; protein: interleukin 10; protein: interleukin 10 ( IL-10 ) receptor; protein: IL-10; protein: STAT proteins