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Human T - cell leukemia virus type I ( HTLV - I ) encodes a 40 - kDa nuclear protein , Tax , which stimulates transcription from three 21 - base pair ( bp ) repeats in its U3 region .
 GENE: Tax
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Tax