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Renal expression of collagen (Col) I (a), Col IV (b), fibronectin (c) mRNAs in ZL and ZDF rats. Total RNA was extracted from renal tissues using TRIzol. The relative levels of specific mRNAs were determined by RT-PCR. Results were normalized to β-actin. All values are means ± SEM (n = 5, each group). *P < .05.
