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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 .
 Human T - cell leukemia virus type I ( HTLV - I ) Tax
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Human T - cell leukemia virus type I ( HTLV - I ) Tax