1894
Previous studies have shown that activation of the signal transducer and activator of transcription 5 ( STAT5 ) plays an essential role in leukemogenesis mediated through constitutive activated protein tyrosine kinases ( PTK ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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