Classification by type of ions
Cl:  대략 13종, ClCs, CLICs, Bestrophins and CFTRs.
K:
- Voltage-gated potassium channels e.g., Kvs, Kirs etc.
- Calcium-activated potassium channels e.g., BKCa or MaxiK, SK, etc.
- Inward-rectifier potassium channels
- Two-pore-domain potassium channels: This family of 15 members
Na
- Voltage-gated sodium channels (NaVs)
- Epithelial sodium channels (ENaCs)[18]
Ca  (CaVs)
Proton channels
- Voltage-gated proton channels
Non-selective cation channels:  Na+, K+ Ca2+ ...
- Most TRPC(transient receptor potential channels)

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