PEBP1 and diabetic kidney disease: We further analyzed the urinary excretion of RKIP/p-RKIP in 6 CKD patients, 3 with biopsy-proven diabetic nephropathy (Kimmestiel-Wilson glomerulosclerosis) and 3 with biopsy-proven non diabetic glomerulopathy (Membranous Nephropathy) (Figure 6D–6E).