Cys-loop superfamily

 Glutamate-gated cation channels

 Epithelial and related Na+ channels

 Voltage-gated cation channels

 Related to voltage-gated cation channels

 Related to inward rectifier K+ channels

 Chloride channels

 Related to ATPase-linked transporters

 Related to neurotransmitter transporters

 Non-ion channels

   Aquaporins

   Aquaglyceroporins or glycerol-uptake facilitators