mortality/aging
• died within the first day of birth
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renal/urinary system
• absent glomeruli and their associated tubules in neonates
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• nephron development was arrested at the stage of the renal vesicle
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• medulla was not correctly formed in neonates
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• neonates had small metanephroi without nephrons but with normal ureters and normal reproductive tracts
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• neonates had small metanephroi with no nephrons
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• shrunken bladder with no urine
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