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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: J Comp Physiol B. 2018 May 24;188(6):899–918. doi: 10.1007/s00360-018-1164-3

Fig. 1.

Fig. 1

The direction of urea, NaCl, and H2O movement in the vasa recta and long-looped nephron according to countercurrent multiplication and the passive mechanism. See text for details.