tokens: Paramyxovirus infection induced a 5- to 10-fold increase in the steady-state level of TNF-alpha RNA in U9-IIIB cells compared with U937 cells , suggesting that HIV-infected monocytic cells produced higher levels of TNF-alpha than did normal cells after a secondary virus infection .
folded_tokens: paramyxovirus infection induced a 5- to 10-fold increase in the steady-state level of tnf-alpha rna in u9-iiib cells compared with u937 cells , suggesting that hiv-infected monocytic cells produced higher levels of tnf-alpha than did normal cells after a secondary virus infection .
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