Functional assays of identified PRPs. The enzymatic activities of A, SOD, B, LDH, C, ADH, and D, GST were analyzed for control (CK) and diabetic (DK) rat kidney protein lysate using protocols described in supplemental method S1. In DK, significant reduction in enzymatic activity was observed. Bars represent means ± S.E. from three independent experiments. *p < 0.05.