Anoctamin 4, or, ANO4, is a human gene. Other names include: Anoctamin-4; Transmembrane protein 16D; TMEM16D. The encoded protein has an amino acid length of 955 and a mass of 111.5 kDa. Other isoforms may exist. Anoctamin 4 is a member of the Anoctamin family. This gene shares homology with other species, including: Mouse, Rat, Frog, Chicken.