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However, viruses containing mutations in either the TAR loop sequences or stem secondary structure which were very defective for gene expression in untreated Jurkat cells , gave nearly wild-type levels of gene expression in phorbol ester -treated Jurkat cells but not in phorbol ester -treated HeLa or U937 cells .
 cell line: Jurkat cells; DNA: stem secondary structure; cell line: phorbol ester -treated HeLa; cell line: U937 cells; cell line: Jurkat cells; cell line: phorbol ester -treated Jurkat cells; DNA: TAR loop sequences
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: Jurkat cells; DNA: stem secondary structure; cell line: phorbol ester -treated HeLa; cell line: U937 cells; cell line: Jurkat cells; cell line: phorbol ester -treated Jurkat cells; DNA: TAR loop sequences