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The activation of Janus protein tyrosine kinases ( Jak ) and STAT ( signal transducer and activator of transcription ) proteins has recently been linked to the signal transduction mechanism of several cytokines .
 protein: STAT ( signal transducer and activator of transcription ) proteins; protein: cytokines; protein: Janus protein tyrosine kinases; protein: STAT; protein: Jak; protein: signal transducer and activator of transcription
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: STAT ( signal transducer and activator of transcription ) proteins; protein: cytokines; protein: Janus protein tyrosine kinases; protein: STAT; protein: Jak; protein: signal transducer and activator of transcription