Fig 6. Nitric Oxide levels inferred from nitrate plus nitrite levels in neutrophil lysates.

IFN-γ was administered to healthy volunteers just after blood was taken for the time 0 time point and cell lysates were prepared from isolated neutrophils at the indicated times. Nitrate plus nitrite levels were measured by a colorimetric assay. The data is presented as mean ± SEM for n≥6 samples. The asterisk indicates significant difference (p = 0.040) from time 0 (two-tailed t-test).