Alpha-1-Antichymotrypsin

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** Alpha-1-antichymotrypsin (423 aa, ~48 kDa) is encoded by the human SERPINA3 gene. This protein is involved in the inhibition of neutrophil cathepsin G and mast cell chymase proteolytic activity.

**Synonyms:** - ACT - Cell Growth-Inhibiting Gene 24/25 Protein - Growth-Inhibiting Protein 24 - Growth-Inhibiting Protein 25 - Serpin A3