Carcinine transporter which is required for recycling of the neurotransmitter histamine in photoreceptor neurons of the compound eye. Following histamine release from photoreceptors and its uptake by glia where it is converted to carcinine, required for the uptake of carcinine from glia into photoreceptor cells where it can be hydrolyzed by tan to form histamine and beta-alanine. Expressed predominantly in photoreceptor axon termini. Expressed in photoreceptor cells. Defective photoreceptor synaptic transmission, significantly reduced phototaxis and decreased levels of histamine in photoreceptor terminals. Belongs to the major facilitator (TC 2.A.1) superfamily. Organic cation transporter (TC 2.A.1.19) family. Truncated N-terminus.