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On several occasions we have observed retrovirus-like particles ( RVLPs ) by transmission electron microscopy ( EM ) of cultured T cells from a patient with MS .
 cell line: cultured T 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:
 cell line: cultured T cells