| Membrane transport protein: ion channels |
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| Ca2+: Calcium channel | Voltage-dependent calcium channel (L-type/Cav1.2, Cav2.1, N-type, P-type, Q-type, R-type, T-type) - Inositol triphosphate receptor - Ryanodine receptor - Cation channels of sperm - Two-pore channel |
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| Na+: Sodium channel | Nav1.4 - Nav1.5 - Nav1.7- Nav1.9 - Epithelial sodium channel |
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| K+: Potassium channel | Voltage-gated (Kv1.1, KvLQT1, KvLQT2, KvLQT3, HERG, Shaker gene, KCNE1) - Calcium-activated (BK channel, SK channel, SK3) - Inward-rectifier (ROMK, Kir2.1, KCNJ11) - Tandem pore domain |
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| Cl-: Chloride channel | Cystic fibrosis transmembrane conductance regulator |
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| Porin | Aquaporin (1, 2, 3, 4) - Voltage-dependent anion channel |
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| Cations: TRP | TRPA - TRPC (TRPC6) - TRPM (TRPM6) - TRPML (Mucolipin-1) - TRPP - TRPV (TRPV1, TRPV6) |
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| Other/general | Voltage-gated ion channel - Ligand-gated ion channel - Cyclic nucleotide-gated ion channel - Stretch-activated ion channel |
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