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 .
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 .
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