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Expression of hyperpolarization-activated cyclic nucleotide-gated channel (HCN)4 and Caveolin-3 (Cav3) in human adult and fetal cardiomyocytes (CM). Human adult ventricular (hAV) (A) and atrial (hAA) (B) CM expressing HCN4 (green) and Cav3 (red). Colocalization is observed upon merging (yellow). (C) Human fetal (hF) CM expressing HCN4 (green) and Cav3 (red). No colocalization is observed upon merging. Color images available online at www.liebertpub.com/scd
