
1) Mesonephron
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https://www.crosswordclues.com/clue/mesonephros

The mesonephros (middle kidney) is one of three excretory organs that develop in vertebrates. It serves as the main excretory organ of aquatic vertebrates and as a temporary kidney in reptiles, birds, and mammals. The mesonephros is included in the Wolffian body after Caspar Friedrich Wolff who described it in 1759. (The Wolffian body is composed ...
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http://en.wikipedia.org/wiki/Mesonephros

• (n.) The middle one of the three pairs of embryonic renal organs developed in most vertebrates; the Wolffian body.
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http://thinkexist.com/dictionary/meaning/mesonephros/

permanent kidney of amphibians and most fish, developing posterior to and replacing the pronephros of the embryonic and larval stages. It is a ... [5 related articles]
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http://www.britannica.com/eb/a-z/m/76

(mez″o-) (me″zo-nef´ros) pl. mesoneph´roi the organ of excretion in the embryo, arising above the pronephros and using its duct. adj., mesoneph´ric., adj.
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http://www.encyclo.co.uk/local/21001
Mes`o·neph'ros noun [ New Latin , from Greek
me`sos middle +
nefro`s kidney.]
(Anat.) The middle one of the three pairs of embryonic renal organs developed in most vertebrates; the Wolffian body.
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http://www.encyclo.co.uk/webster/M/53

Type: Term Pronunciation: mez′ō-nef′ros, -roy Definitions: 1. One of three excretory organs appearing in the evolution of vertebrates; in life forms with a metanephros, the mesonephros is located between the regressing pronephros and the metanephros, cephalic to the latter. In young mammalian embryos, the mesonephros is well develo...
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http://www.medilexicon.com/medicaldictionary.php?t=54479
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