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The nephrons of the mesonephros, the functional organ in most anamniotes called opisthonephros, are slightly more complex than those of the pronephros. The main difference between the pronephros and the mesonephros is that the pronephros consists of non-integrated nephrons with external glomeruli. The most complex nephrons are found in the metanephros of birds and mammals. The kidneys of birds and mammals have

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