| AC | action current; |
| HCN channel | hyperpolarization-activated cyclic nucleotide-gated channel; |
| HNK | honokiol (2-(4-hydroxy-3-prop-2-enyl-phenyl)-4-prop-2-enyl-phenol); |
| I h | hyperpolarization-activated cation current; |
| IC50 | the concentration required for 50% inhibition; |
| I K(DR) | delayed-rectifier K+ current; |
| SEM | standard error of the mean; |
| τact | activation time constant. |
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