Probable choline transporter. May be involved in membrane synthesis and myelin production. Expressed in neurons, oligodendrocytes and astrocytes. Also expressed in the mucosal cell layer of the colon. In the developing brain, isoform 1 is expressed in both neurones and oligodendroglial cells, whereas isoform 2 is restricted to oligodendroglial cells. By leukemia inhibitory factor or retinoic acid in vitro. In vivo, induced during the axonal elongation period following axotomy. Belongs to the CTL (choline transporter-like) family.