1620
The changes in gene expression brought about by gamma interferon are thought to involve transient increases in the activities of cellular protein tyrosine kinases , including the Janus kinases Jak1 and Jak2 , leading to tyrosine phosphorylation of the transcription factor Stat1 .
 protein: gamma interferon; protein: Jak2; protein: Janus kinases; protein: transcription factor Stat1; protein: Jak1; protein: Stat1; protein: cellular protein tyrosine kinases
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: gamma interferon; protein: Jak2; protein: Janus kinases; protein: transcription factor Stat1; protein: Jak1; protein: Stat1; protein: cellular protein tyrosine kinases