Fig. 4. Inhibition of response by glutathione. (A) Time scans and (B) integrated intensity of the chemiluminescent emission of 20 μM PNCL, 200 μM ONOO^– and 0 (blue trace), 50 μM, 100 μM, 200 μM, and 1 mM (red trace) glutathione. (C) Time scans and (D) integrated intensity of the chemiluminescent emission of 20 μM PNCL, 200 μM Angeli's salt and 0 (blue trace), 50 μM, 100 μM, 200 μM, and 1 mM (red trace) glutathione. All experiments were performed in 20 mM HEPES (pH 7.4), containing <1% DMSO.