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Figure 6: (a) Representative immunohistochemical staining of coronary arteries for DHE and vWF. Scale bar: 200 m. (b–d) The ROS production, SOD activity, and MDA formation in HUVECs after incubation with 0.1% or 3% PolyPHb. One unit of SOD activity corresponded to 50% reduction of absorbance at 550 nm. Values are presented as mean ± SD ( to 6 per group). and versus the 0.1% PolyPHb group; and versus the Control group. DHE: dihydroethidium; ROS: reactive oxygen species; SOD: superoxide dismutase; MDA: malonaldehyde; HUVECs: human umbilical vein endothelial cells.