Cystatin-SN

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

**Definition:** Cystatin-SN (141 aa, ~16 kDa) is encoded by the human CST1 gene. This protein plays a role in the inhibition of certain cysteine proteinases in the saliva, tears, urine and seminal fluid.

**Synonyms:** - CST1 - Cystain-SA-I - Cystatin 1 - Cystatin SA-I - Cystatin SN - Cystatin-1 - Salivary Cystatin-SA-1