mortality/aging
• mice die around E11
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renal/urinary system
• at E10.5, the ureteric bud is absent
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embryo
• at the 17-somite stage, the mesonephros, identified by Pax2 staining, is delayed in its caudal extension
• at 27 somites, only a single and discontinuous row of Pax2+ cells reaches the tip of the tail
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• at E9.25, swelling in the nephric duct is apparent
• at E9.5, the nephric duct is absent and the nephric cord undergoes apoptosis
• at E9.5 to E10.5, ectopic nephric ducts grow towards the surface ectoderm
• at E10.5, the nephric duct and ureteric bud are absent
• in about 65% of mice, the nephric duct initiates caudal extension but moves away from the nephric cord and fuses to surface ectoderm
• no nephric ducts reach the cloaca
• nephric ducts contain 2.6-fold more cells than in wild-type mice and undergo a 4.6-fold increase in proliferation relative to wild-type mice
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• at E9.5, the nephric duct is absent and the nephric cord undergoes apoptosis
• at E10.5, the nephric duct is absent
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