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Five vascular bundles from a transverse section at 100 μm below the outer medullary (OM)-inner medullary (IM) boundary [collecting ducts (CDs), aquaporin-2 (AQP2)/blue; descending vasa recta (DVR), urea transporter B (UT-B)/green; vessels of the intracluster region (AVR1) and in the intercluster region (AVR2), PV-1/red]. Vascular bundles are located predominantly in the intercluster region, distant from CDs. In the intracluster region, fenestrated vessels abut CDs. Scale bar = 100 μm.
