C6orf150, or Mab-21 domain containing 1, is a human gene encoded by MB21D1. It may also be known as: Cyclic GMP-AMP synthase; cGAMP synthase; cGAS; h-cGAS; Mab-21 domain-containing protein 1. The encoded protein is an enzyme with an amino acid length of 522 and a mass of 58.8 kDa. Other isoforms may exist. C6orf150 is a member of the Mab-21 family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.