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Human herpesvirus 6 , a predominantly T lymphotropic virus , has been recently shown to infect some EBV -positive B cell lines , and to induce in them the activation of the EBV lytic cycle .
 cell line: EBV -positive B cell lines
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 cell line: EBV -positive B cell lines