text: <unk> s are a superfamily of poorly understood ion<unk> s consisting of approximately 13 members.
  It is now recognised that<unk> s display a variety of important physiological and cellular roles that include regulation of pH, volume homeostasis, organic solute transport, cell migration, cell proliferation and differentiation. A number of different gene products have been shown to function as<unk> s. Based on sequence homology the<unk> s can be subdivided into a number of groups. The importance of one such group, the CLC family of<unk> s, can be seen from the diseases that develop when the<unk>  does not function normally.
option_0: Chloride channel
option_1: Calcium channel
option_2: Sodium channel
option_3: Ion transporter
option_4: Light-gated ion channel
option_5: Ion channel
option_6: Cyclic nucleotide-gated ion channel
option_7: Voltage-gated ion channel