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The most prevalent mutation identified is a gain - of - function mutation in the Janus kinase ( JAK ) family , JAK2 V617F , which has been identified in more than half of patients with myelofibrosis .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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