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Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels belong to the superfamily of voltage-gated potassium (Kv) and cyclic nucleotide-gated (CNG) channels. HCN channels contain the glycine-tyrosine-glycine (GYG) sequence that forms part of the selectivity filter, a similar structure than some potassium channels; however, they permeate both sodium and potassium, giving rise to an inward current. Yet a second amino acid sequence, leucine-cysteine-isoleucine (LCI), next to GYG, is well-preserved in all HCNs but not in the sel