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Intravenous pyelography (IVP) was performed at 5 and 30 minutes after the injection of Omnipaque in Cldn4+/− and Cldn4−/− mice (7–8 months old). Typical examples of Cldn4−/− mice are indicated: No. 1, 8 months old; No. 2, 7 months old; and No 3., 7 months old. Arrows indicate the depicted pelvises and “B” indicates bladders.
