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Human herpesvirus 6 variant A , but not variant B , infects EBV -positive B lymphoid cells , activating the latent EBV genome through a BZLF-1 -dependent mechanism .
 DNA: latent EBV genome; protein: BZLF-1; cell line: EBV -positive B lymphoid cells
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:
 DNA: latent EBV genome; protein: BZLF-1; cell line: EBV -positive B lymphoid cells