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Ultrastructure of interstitial nodal spaces in a transverse ultrathin section from kangaroo rat inner medulla. Interstitial nodal spaces are marked with an X. AVR, fenestrated ascending vasa recta; ATL, ascending thin limb; CD, collecting duct. Section is from midway between the outer medullary-inner medullary boundary and papilla tip. Scale bar, 10 μm. Reproduced from Issaian et al. 2012, with permission.
