Fig. 8.

AVR₁ ascending directly from the outermost IM into the innermost inner stripe of the OM [CDs, AQP2/blue; ascending thin limbs of Henle's loop (ATLs) in the IM and thick ascending limbs in the OM, ClC-K/green; DVR, UT-B/yellow; AVR₁ and AVR₂, PV-1/red]. In B autofluorescence in thick ascending limbs appears as light blue-gray. A: thick ascending limbs (OM) and ATLs (IM). B: fenestrated vessels at the OM-IM boundary (AVR). C and D: enlarged boxed areas. E: plane of tissue section through the OM-IM boundary. Scale bars = 40 μm.