Low-affinity, high capacity permease involved in the transport of the cationic amino acids (arginine, lysine and ornithine). Expressed in liver, pectoralis and gastrocnemius. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay. Lacks the domain responsible for mediating amino acids transport. Belongs to the amino acid-polyamine-organocation (APC) superfamily. Cationic amino acid transporter (CAT) (TC 2.A.3.3) family.