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Human T - cell leukemia virus type I ( HTLV - I ) Tax is a potent transcriptional regulator that can activate or repress specific cellular genes and that has been proposed to contribute to leukemogenesis in adult T - cell leukemia .
 GENE: Human T - cell leukemia virus type I ( HTLV - I ) Tax
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: Human T - cell leukemia virus type I ( HTLV - I ) Tax 
Answer:
 GENE: Human T - cell leukemia virus type I ( HTLV - I ) Tax