Proton-linked monocarboxylate transporter that mediates creatine transport across the plasma membrane. Interacts with isoform 2 of BSG. Most highly expressed in kidney, followed by retina, lung, heart and testis. Very weakly expressed in brain and liver. Also detected in lens. The disease is caused by variants affecting the gene represented in this entry. Belongs to the major facilitator superfamily. Monocarboxylate porter (TC 2.A.1.13) family. It is uncertain whether Met-1 or Met-31 is the initiator. Truncated N-terminus.