Choline transporter. Interacts with COCH. Expressed at high levels in lung, colon, inner ear and spleen (at protein level). Progressively lower levels in brain, tongue, liver and kidney (at protein level). In the kidney, prominent expression in glomeruli in the lining of Bowman's capsule and on the mesangial cells adjacent to the vessels within the glomerulus (at protein level). Strongly expressed on the membranes of splenocytes and in lung parenchyme (at protein level). Isoform 1 is expressed at higher levels than isoform 2 in colon, heart, kidney, lung, cochlea, tongue and muscle, as well as in the inner ear. Isoform 2 is predominant in brain, liver and spleen. Produced by alternative promoter usage. Belongs to the CTL (choline transporter-like) family.