CMTM4 is a symbol for the gene, CKLF-like MARVEL transmembrane domain containing 4, in humans. Other names include: CKLF-like MARVEL transmembrane domain-containing protein 4; Chemokine-like factor superfamily member 4; CKLFSF4. The encoded protein has an amino acid length of 234 and a mass of 25.8 kDa. Other isoforms may exist. CMTM4 is a member of the Chemokine-like factor family. This gene shares homology with other species, including: Frog.