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. 2016 Oct 3;12(5):3233–3241. doi: 10.3892/etm.2016.3766

Figure 3.

Figure 3.

Immunohistochemistry of hyperpolarization-activated cyclic nucleotide-gated channel 4 (HCN4) and connexin 43 (Cx43) expression in transverse sections of the whole heart of rats without arrhythmia. Expression of HCN4 (green) and Cx43 (red) in the (A) SAN, (B) LA, (C) RSPV and (D) LIPV. Scale bar, 20 µm. (E) Masson's trichrome-stained transverse section of the whole heart, boxes represent the locations of A, B, C and D. Scale bar, 5,000 µm. LA, left atrium; SAN, sinoatrial node; RSPV, right superior pulmonary vein; LIPV, left inferior pulmonary vein.