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Hcn4 expression in the proximal junction of the PV and LSVC myocardium of an adult mice. (A) Dorsal view of EGFP expression (arrowheads) in an adult Hcn4CreERT2; ROSAmTmG mouse seven days after tamoxifen induction. (B) Hcn4 positive cells (arrowheads) in the junction between the PV and LSVC of the same mouse. LV, left ventricle; PV, pulmonary vein; TR, Trachea; LAA, left atrial appendage; LSVC, left superior vena cava.
