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meta·neph·ros

npl  -neph*roi   :  either member of the final and most caudal pair of the three successive pairs of vertebrate renal organs that functions as a permanent adult kidney in reptiles, birds, and mammals but is not present at all in lower forms - compare MESONEPHROS PRONEPHROS  .
 
   

 
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North Big Horn Hospital District (Lovell, Wyoming - Big Horn County)