Immunostaining of nitrotyrosine and CuZn-SOD in kidney tissue sections from nonhypertensive, hypertensive, and preeclamptic patients. Enhanced nitrotyrosine staining is seen in tissue sections from preeclampsia, C-1, compared to those of controls, A-1 and B-1, respectively. The pattern for CuZn-SOD expression is opposite. CuZn-SOD immunostaining is much reduced in preeclamptic tissue sections, C-2, compared to those from nonhypertensive and hypertensive controls, A-2 and B-2, respectively. Arrowhead indicates podocytes; CuZn-SOD = CuZn-superoxide dismutase; PE = preeclampsia. Bar = 20 µm.