1032
Since many cytokines that activate Jak kinases also lead to the tyrosine phosphorylation and activation of members of the Stat family of transcription factors , the ability of IL-2 to trigger Stat phosphorylation was examined.
 protein: Jak kinases; protein: kinases; protein: Stat family; protein: IL-2; protein: cytokines; protein: transcription factors
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: Jak kinases; protein: kinases; protein: Stat family; protein: IL-2; protein: cytokines; protein: transcription factors