Chloride potassium symporter
The chloride potassium symporter is a membrane transport protein of the solute carrier family 12 that is present in the S3-segment of the renal proximal tubule and in the neuron. It functions in renal chloride reabsorption to transport chloride across the basolateral membrane.
Source: Wikipedia — Chloride potassium symporter (CC BY-SA 4.0)