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The tax gene product of human T-cell leukemia virus type I ( HTLV-I ) is a potent transcriptional activator that both stimulates viral gene expression and activates an array of cellular genes involved in T-cell growth .
 protein: transcriptional activator; cell type: T-cell; DNA: cellular genes
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: transcriptional activator, T-cell, cellular genes 
Answer:
 protein: transcriptional activator; cell type: T-cell; DNA: cellular genes