A disintegrin and metallopeptidase domain 33, or ADAM metallopeptidase domain 33, is a human gene encoded by ADAM33. It may also be known as: Disintegrin and metalloproteinase domain-containing protein 33; ADAM 33; C20orf153; DJ964F7.1. The encoded protein is an enzyme with an amino acid length of 813 and a mass of 87.7 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Mouse, Rat, Frog, Chicken.