Immunolocalization of tubules and vessels in the Munich-Wistar medulla. A: Inner stripe of the outer medulla. Bundle regions (two are circled) consist of DVR, unbranched AVR (not shown) and short loop DTLs. Interbundle regions consist of long-loop DTLs, thick ascending limbs, CDs and networks of branching AVR (AVR are not shown). B: Inner medulla (approximately 900 μm below the outer medulla). Intracluster regions (circles) consist of CDs, descending and ascending thin limbs and networks of branching AVR (the latter three are not shown). The intercluster regions (boxes) consist of descending and ascending thin limbs, DVR and AVR (ATLs and AVR are not shown). Scale bars: 100 μm. Modified from Pannabecker 2013, with permission.