The GFR of control and PCmas−/− mice was determined by transcutaneous measurement of FITC-sinistrin as described previously.21 Briefly, fluorescent signals were measured with a Transdermal GFR Monitor (MediBeacon GmbH, Mannheim, Germany) before and after retrobulbar injection of FITC-sinistrin (7.5 mg/100 g body wt) in anesthetized mice. The GFR was calculated from the t1/2 of FITC-sinistrin in the blood.
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