renal/urinary system
• at E13.5, one of 13 male heterozygotes had a unilateral double ureter
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• at E13.5, heterozygotes show a slight decrease in ureteric bud branching relative to wild-type controls
• however, both kidneys are present and kidney volume is not significantly decreased
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• at E13.5, the number of ureteric bud tips is slightly reduced
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