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IL-6 production by HIV-infected macrophages. The cells were cultured in the presence of macrophage colony-stimulating factor (M-CSF) and stimulated by lipopolysaccharide (LPS) when HIV-p24 antigen in the supernatants was equal to or more than that presented in Table 2. The supernatants were harvested after 24 h of incubation. The data represent the mean of three experiments each carried out in duplicate. The error bars represent s.e.m.
