Examlex
How did the Ptolemaic rule of Egypt differ from the Seleucid kingdom?
Pronephros
In the embryos of higher vertebrates, a series of tubules emptying into the celomic cavity. It is a temporary structure in the human embryo, followed by the mesonephros and still later by the metanephros, which gives rise to the kidney.
Mesonephros
A temporary kidney structure found during the embryonic development of mammals, later replaced by the permanent kidneys.
Allantois
An extra-embryonic membrane in birds and reptiles, involved in gas exchange and waste removal during embryonic development.
Neural Groove
A shallow groove on the surface of the neural plate during embryonic development that eventually deepens to form the neural tube.
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