Cystatin-S

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

**Definition:** Cystatin-S (141 aa, ~16 kDa) is encoded by the human CST4 gene. This protein plays a role in the inhibition of papain, ficin and several other cysteine proteinases.

**Synonyms:** - CST4 - Cystain-SA-III - Cystatin 4 - Cystatin S - Cystatin-4 - Salivary Acidic Protein 1