| AP | action potential |
| DPCPX | 8-cyclopentyl-1,3-dipropylxanthine |
| GL | Gandoderm lucidum (Língzhī or Reishi) |
| GTs | Ganoderma triterpenoids |
| HCN gene | hyperpolarization-activated cyclic nucleotide-gated gene |
| I-V | current versus voltage |
| IC50 | the concentration required for half-maximal inhibition |
| I h | hyperpolarization-activated cation current |
| 8-PST | 8-(p-sulfophenyl)theophylline |
| τact | activation time constant |
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