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The mesonephros and metanephros of amniotes are derived from different parts of the anamniote opisthonephros. The metanephros is derived from the posterior part of the opisthonephros. In amniotes, most of the former opisthonephros became the
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tissue from which in amniotes both mesonephros and metanephros come.” Some accounts call opisthonephros the ‘mesonephros’, but the opisthonephros in anamniotes (lampreys, fish, and amphibians) differ considerably than the mesonephros in
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Ooi EC; Youson JH (1977). "Morphogenesis and growth of the definitive opisthonephros during metamorphosis of anadromous sea lamprey, Petromyzon marinus L.".
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The kidney of the frog is an opisthonephros. The kidneys are seen as two elongated, red organs in this image.
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from the posterior nephric ridge. The functional embryonic kidney in
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