1267
Here we have confirmed and extended such observations, showing that (1) this phenomenon is restricted to the variant A of HHV-6 : in fact two isolates belonging to the HHV-6 variant B ( BA92 and Z29 ) were neither able to infect any B cell line , independently of the EBV status , nor to induce the EBV genome expression .
 cell line: B cell line
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: B cell line