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Densitometric analysis of urinary retinol‐binding protein (RBP) by Western blot in clinically healthy (control) dogs and in dogs with chronic kidney disease (CKD), according to the International Renal Interest Society staging criteria. C: control; S1: stage 1 (CKD); S2: stage 2 (CKD); S3: stage 3 (CKD); S4: stage 4 (CKD). *P ≤ 0.05; ***P ≤ 0.001; ****P ≤ 0.0001.
