Mechanisms of urea retention in the renal medulla.
D000818:Animals; D007677:Kidney Function Tests; D007684:Kidney Tubules / Q000378:metabolism / Q000502:physiology*; D051381:Rats; D014508:Urea / Q000378:metabolism*; D014867:Water / Q000378:metabolism
D014867:Water; D014508:Urea