HCN channels are activated upon hyperpolarization of membrane potential and cAMP binding leading to K+ efflux.
Moroni, A, Bianchi, ME, Gorza, L, Longhi, R, DiFrancesco, D, Beltrame, M, Altomare, C, Vitadello, M, Heurteaux, C, Malgaroli, A, Vaccari, T, Gravante, B
cation channel activity of HCNs:cAMP [plasma membrane]
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