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. 2013 Dec 19;2(6):e000246. doi: 10.1161/JAHA.113.000246

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© 2013 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley Blackwell.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Figure 3. — Immunohistochemical detection of AV rings and retroaortic node (and also principal tissues making up CCS). A and B, Long‐axis tissue sections immunolabeled for HCN4 (green signal) and Cx43 (red signal). Sections taken at level of AVN (A) and His bundle (B). C, High‐magnification image of HCN4 labeling in right ring. AM indicates atrial muscle; AVN, atrioventricular node; HIS, penetrating or His bundle; IVS, interventricular septum; LBB, left bundle branch; RAN, retroaortic node; RR, right ring; SN, sinus node; VM, ventricular muscle.