The goal of this study is to learn about CXCL3 as a biomarker for type 2 diabetic kidney disease (DKD) in adults between age of 18-80. The main question it aims to answer is: * Is CXCL3 elevated in the serum or urine of type 2 adult DKD patients compared to normal control or diabetes mellitus without kidney involvement? * Is CXCL3 elevated in the mRNA of PBMC of type 2 adult DKD patients compared to normal control or diabetes mellitus without kidney involvement? * Is CXCL3 elevated in the kidney tissue of type 2 adult DKD patients compared to normal control or other glomerulonephritis? Participants have already been diagnosed as DKD by renal biopsy.
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Serum and Urine CXCL3 level by Enzyme linked immunosorbent assay (Elisa)
Timeframe: From enrollment to the end of experiment at 4 weeks