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Human herpesvirus 6 ( HHV-6 ) is a lymphotropic herpesvirus , and in vitro, it can productively infect human CD4+ T cells as HIV-1 .
 cell line: CD4+ T cells
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: CD4+ T cells 
Answer:
 cell line: CD4+ T cells