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. 2018 May;15(5):752–760. doi: 10.1016/j.hrthm.2017.12.027

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© 2018 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Supplemental Figure 4 — Masson’s trichome. Young and old inferior nodal extension (INE). The top panel (A,B,C) show sections at INE level at different magnifications in a young heart and bottom panel (D,E,F) shows the comparable images in old heart at INE level INE is marked with a black dotted line. Myocytes are pink/purple and nuclei are black blue in high magnification images (C, F). Left atrium (LA), right atrium (RA), left ventricle (LV), right ventricle (RV). Bar is shown in each image. The red colour seen in A and D is clotted blood.