Binding of cAMP to HCN channels
type: GO_0003674
BFO_0000050: HCN channels

Activation of HCN channels
type: Restriction
  on property: BFO_0000066
  some values from: GO_0005886
type: GO_0005261
BFO_0000050: HCN channels

HCN channels
type: GO_0008150