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Definition: in embryos, a partition dividing the cloaca into a dorsal, rectal portion and a ventral portion called the urogenital sinus; reaching the cloacal membrane at about the time of its disintegration, the urorectal septum divides the cloacal exit into an anal and a urogenital orifice.
Synonym(s): urorectal fold
Examples: glitazone, GI cocktail, etc.
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